Epa Masks
The monumental carved headdress tradition of northeastern Yorubaland, detailing its physical construction, workshop masters, ritual performance, museum provenance, and scholarly debates.
Ẹpa masks are monumental polychrome wooden headdresses native to the Èkìtì and Ìgbómìnà regions of northeastern Yorùbáland. Carved from a single block of wood, each mask unites a grooved, helmet-shaped base with an intricate, multi-figured superstructure celebrating communal leadership, martial defense, ancestral power, and fertility. During annual festival cycles, masqueraders bear these massive structures, which can weigh up to seventy pounds, in athletic performances designed to secure spiritual favor and test the physical fortitude of the community.
Unlike many African sculptural traditions that early Western scholarship recorded as anonymous, the Ẹpa tradition is associated with named master carvers and well-documented regional workshops active in the late nineteenth and twentieth centuries. This file examines the material techniques, named sculptors, performance mechanics, museum histories, and unresolved scholarly debates surrounding Ẹpa and related helmet headdresses.
Form, Technique, and Materials
Structurally and conceptually, an Ẹpa mask consists of two distinct components carved together from a single piece of wood :
- The helmet base (ìkòkò): The lower section is a grooved helmet base, literally glossed as ìkòkò (pot), referencing its hollow, hemispherical chamber . This base is typically carved into an abstracted, stylized human face or a Janus-faced composition with two opposing faces. It features a wide, open mouth with pierced oral apertures that provide the dancer with essential ventilation and sightlines during performance . The surface of the ìkòkò often presents geometric registers, prominent eyes, and stylized scarification marks, serving as a stable visual pedestal for the figurative world above it.
- The figurative superstructure: Rising directly from the crown of the helmet base is an elaborate, multi-tiered figurative composition that can reach heights of four feet and total weights between fifty and seventy pounds . The superstructure depicts central cultural archetypes: an equestrian warrior (Jagunjagun), an enthroned monarch (Ọràngún), a mother nursing children (Ìyá), or herbalist-priests and ritual functionaries surrounded by attendant retinues of musicians, praise singers, and captives .
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| FIGURATIVE SUPERSTRUCTURE |
| - Up to 4 feet high; total mask weight: 50 to 70 pounds |
| - Intricate openwork carving from the same wood block |
| - Iconography: Equestrian warriors (Jagunjagun), kings |
| (Ọràngún), maternal figures (Ìyá), musicians, attendants |
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| HELMET BASE (ÌKÒKÒ / POT) |
| - Abstracted or Janus-faced helmet |
| - Open oral cavity providing sightlines and ventilation |
| - Rests directly over the performer's head |
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Wood Selection
Carvers in the Èkìtì and Ìgbómìnà workshops select specific lightweight, easily carved softwoods to ensure the headdress is structurally sound yet manageable for the masquerader :
- Alstonia congensis and Alstonia boonei (Yorùbá: àhun): A soft, pale wood favored for its low density, straight grain, and responsiveness to fine adze work .
- Cordia millenii (Yorùbá: ọmọ): A lightweight timber offering durability, resistance to splitting, and acoustic resonance .
- Ricinodendron heudelotii: A very light softwood utilized in regional workshops to reduce the overall mass of monumental superstructures .
Despite the use of low-density timbers, carving an Ẹpa headdress requires high technical skill. The sculptor subtracts wood from a single log, excavating the deep interior cavity of the helmet base while simultaneously executing intricate, pierced openwork in the superstructure without compromising the vertical load-bearing axis of the wood grain .
Pigment Systems and Surface Treatment
The completed carving is treated with native mineral and vegetable polychrome pigments, creating dynamic color contrasts across the surfaces :
- Chalk (ẹfun): White pigment derived from natural kaolin deposits, symbolizing coolness, ritual purity, and proximity to the spirit world.
- Charcoal (èédú): Black pigment ground from charred wood, used to define structural contours, facial features, and coiffures.
- Camwood (osùn): Red pigment processed from the heartwood of the Pterocarpus tree, associated with life force, danger, blood, and vitality.
- Indigo (ẹlú): Deep blue-black dye derived from fermented indigo leaves (Philenoptera cyanescens), applied to textiles, hair, and figurative accents.
In the twentieth century, traditional pigment recipes were augmented by imported trade materials, notably Reckitt's laundry bluing (which yielded a vibrant sky-blue hue) and synthetic commercial enamel paints . These introduced glossy finishes and extended the life of surfaces subjected to tropical rain, dust, and handling during annual festivals.
Function, Ritual Context, and Performance
Ẹpa masks are performed during annual festival cycles across northeastern Yorùbá towns to honor ancestral lineages, celebrate heroic warriors, promote agricultural fertility, and purge community impurities . Unlike masquerades that operate in complete secrecy or nocturnal isolation, Ẹpa festivals are large civic pageants involving the entire community, organized along age grades and titled lineages .
The Climax of the Masquerade
The core ritual action of an Ẹpa festival centers on a demanding physical test of balance, agility, and stamina . The masquerader, enveloped in cloth drapery and carrying a superstructure weighing up to seventy pounds upon his head, must dance through the town and execute an acrobatic leap onto a raised earthen mound, often measuring three to four feet in height .
[ Procession through town ]
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[ Gathering at community square ]
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[ Acrobatic Leap atop 3–4 ft Earthen Mound ]
├── CLEAN LANDING WITHOUT STUMBLE ──► Omen of peace, bountiful harvest, community health
└── STUMBLE, SLIP, OR COLLAPSE ──► Omen of disaster, barrenness, communal misfortune
The performer must land cleanly atop the mound without stumbling, dropping the mask, or losing footing . The physical outcome is understood by the community as a divination and omen for the coming year:
- A clean, successful leap indicates that the ancestors and spiritual forces accept the community's offerings, forecasting a bountiful harvest, low mortality, and civic peace .
- A slip, stumble, or fall is interpreted as a grave warning of impending misfortune, famine, disease, or lineage disruption, requiring immediate propitiation and purification .
The athletic requirement explains the formal design of the ìkòkò base: the large, open mouth cavity is engineered to maximize airflow for the runner and provide immediate, unobstructed downward sightlines during the approach to the mound .
Named Master Sculptors and Regional Workshops
Early colonial and Western museum collections routinely classified Yorùbá carving as anonymous communal production. Fieldwork initiated in the mid-twentieth century by Kevin Carroll, and expanded by scholars such as Rowland Abiodun, Henry John Drewal, John Pemberton III, and Roslyn Adele Walker, established that northeastern Yorùbáland was home to highly celebrated named masters who ran dynastic workshops, developed individual styles, and received royal commissions .
BÀMBÓṢÉ OF ÒSÌ-ÌLỌRIN
(d. ca. 1920)
Master of foundational Òsì style
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DADA ARẸÒGÚN OF ÒSÌ-ÌLỌRIN BÁMIGBÓYÈ OF ODÒ-ỌWÁ
(ca. 1880–1954) (ca. 1885–1975)
Multi-tiered master of Master of pierced openwork,
superstructures and narrative Ọràngún kings and warriors
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BANDELE OF ÒSÌ-ÌLỌRIN
(ca. 1910–1995)
Carried Òsì workshop into
the late twentieth century
Dada Arẹògún of Òsì-Ìlọrin (ca. 1880–1954)
Dada Arẹògún (whose name A-rẹ-ọmọ-bì-ògún signifies "one who finds children to birth through Ògún") was an influential sculptor of the Òsì-Ìlọrin workshop in the Èkìtì/Ìgbómìnà border area . Arẹògún is celebrated for his complex, multi-tiered superstructures combining dense narrative vignettes of mounted war leaders, captive retinues, court drummers, and maternal figures . His style is recognized by deep relief carving, rhythmic interlinking of limbs and weapons, and cylindrical facial forms with protruding, almond-shaped eyes framed by prominent lids .
Bámigbóyè of Odò-Ọwá (ca. 1885–1975 / c. 1895–1978)
Bámigbóyè was a master carver, herbalist, and titled priest (Ọdọ̀fin) of Odò-Ọwá in the Ìgbómìnà region . He was famous for expansive, multi-figured superstructures featuring pierced openwork . His masterworks include monumental depictions of the Ọràngún (the traditional monarch of Ìlá) and the equestrian warrior (Jagunjagun), enveloped by layered crowns, standing attendants, palace messengers, and musicians . Bámigbóyè was documented carving both for traditional religious patrons and for early colonial exhibitions and commissions .
Bandele of Òsì-Ìlọrin (ca. 1910–1995)
The son of Arẹògún, Bandele trained directly in his father's workshop and maintained the sculptural lineage of the Òsì carving tradition through the late twentieth century . His carvings reflect the core visual vocabulary of Arẹògún, while introducing sharper angularities and working across traditional ritual settings and modern cross-cultural commissions, including projects organized by Father Kevin Carroll at the Oye-Èkìtì workshop .
Àgbọnbíòfẹ of Èfòn-Alààyè (d. 1945)
Àgbọnbíòfẹ was the leader of the Adéṣínà family carving compound in Èfòn-Alààyè, a major center of Èkìtì sculpture . While known for architectural palace caryatids, he carved celebrated helmet headdresses associated with the Ẹlẹ́fọ̀n festival, characterized by crisp, geometric facial planes, bold diamond-patterned headgear, and balanced vertical symmetry .
Olowe of Ìsẹ̀ (ca. 1873–1938)
Olowe of Ìsẹ̀ was widely regarded in his lifetime as one of the preeminent court sculptors of Yorùbáland . Based in Ìsẹ̀-Èkìtì, Olowe developed an idiosyncratic style marked by dramatic, elongated figures, dynamic bodily movement, deep undercut carving that left figures freely detached from the structural background, and detailed textured surfaces . While best known for palace doors and veranda posts, he produced ceremonial helmet masks that altered conventional frontal arrangements by canting human figures forward to imply motion .
Bamgbose of Òsì-Ìlọrin (d. c. 1920)
A senior contemporary and teacher to Arẹògún, Bamgbose established the foundational formal tenets of the Òsì-Ìlọrin workshop . His works feature robust, authoritative proportions, high-crested equestrian groupings, and carefully structured Janus helmet bases .
Aesthetic Criteria and the Artist's Hand
Yorùbá art criticism evaluates woodcarving through specific indigenous aesthetic concepts identified by Rowland Abiodun, Henry Drewal, and John Pemberton :
- Ojú-onà (Design Consciousness / Artistic Insight): The capacity of the carver to exercise individual aesthetic judgment, organize complex three-dimensional compositions, and innovate within ritual boundaries .
- Dídán (Luminosity / Smoothness of Surface): The degree of surface finish, sanding, and clean paint application that allows forms to catch and reflect light during rapid movement .
- Ìwọ̀ntúnwọ̀nsì (Symmetry and Balance): The structural equilibrium achieved between the weight of the superstructure and the stability of the helmet base, ensuring the masquerader can balance the object during high-velocity motion .
Individual sculptors were not faceless producers of ritual paraphernalia. They were recognized across regional kingdoms, celebrated in personal praise poetry (oríkì), and sought out by lineage heads and royal patrons who traveled across kingdom borders to commission works from specific masters .
Typological and Regional Variations: Ẹpa, Ẹlẹ́fọ̀n, and Aguru
Scholars have documented considerable variation in terminology and classification for helmet headdresses across northeastern Yorùbáland :
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| NOMENCLATURE | PRIMARY REGION / USE | DOMINANT ICONOGRAPHY |
+----------------+-----------------------------------+------------------------------------+
| Ẹpa | Ìgbómìnà / Èkìtì border; | Equestrian warriors (Jagunjagun), |
| | Civic, lineage, and warrior rites | kings (Ọràngún), ancestral balance |
+----------------+-----------------------------------+------------------------------------+
| Ẹlẹ́fọ̀n | Èfòn-Alààyè and Central Èkìtì; | Maternal figures (Ìyá), lineage |
| | Ancestral and fertility rituals | heads, tiered civic retinues |
+----------------+-----------------------------------+------------------------------------+
| Aguru | Òsì-Ìlọrin and northern border; | Janus-faced helmet bases topped by |
| | Lineage and warrior headdresses | equestrian heroes and retinues |
+----------------+-----------------------------------+------------------------------------+
The Terminological Problem
Western museums and international auction catalogues routinely apply the blanket label Epa mask to all large polychrome helmet headdresses from Èkìtì, Ìgbómìnà, and Ìjẹ̀ṣà . Field research demonstrates that local categorization is nuanced :
- In towns such as Ìlá-Ọ̀ràngún and Odò-Ọwá (Ìgbómìnà), the masks are predominantly designated as Ẹpa and are linked to festivals honoring warrior titles and civic lineage foundations .
- In Èfòn-Alààyè and surrounding Èkìtì communities, closely related headdresses are designated as Ẹlẹ́fọ̀n, often featuring specific ancestral characters such as Olókòrò, Ọlọ́jọ́, or Ìyá Ẹlẹ́fọ̀n .
- In Òsì-Ìlọrin and adjacent northern districts, carvers and elders frequently apply the term Aguru to Janus-faced helmet masks carrying equestrian figures and attendants .
Scholars disagree on the theoretical interpretation of these differences. Kevin Carroll treated Ẹpa and Ẹlẹ́fọ̀n as regional dialect variations of a single overarching festival structure . John Pemberton III and Marsha Heyden argue that the variations reflect distinct regional iconographies, ritual cycles, and lineage histories between Èkìtì and Ìgbómìnà towns . Will Rea proposes a structural approach, arguing that Ẹpa and Ẹlẹ́fọ̀n masquerades operate along an interconnected ritual continuum that mediates between the wild forest (igbó) and the civilized human settlement (ìlú) .
Iconography and Hermeneutic Debates
The figurative superstructures of Ẹpa masks depict a broad spectrum of Yorùbá civic and religious life, giving rise to two major interpretive debates in art historical literature.
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| HERMENEUTIC DEBATES ON SUPERSTRUCTURES |
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[ 1. WARRIORS VS. FERTILITY ] [ 2. COMMUNAL NORM VS. ARTIST AGENCY ]
- Martial Reading (Ọlọ́jọ́ / Jagunjagun): - Communal Rule View (Kevin Carroll):
Product of 19th-century warfare, Strict adherence to religious conventions,
honoring defensive military heroes. lineage tradition, and canonical forms.
- Fertility Reading (Ìyá / Òrìṣà Oko): - Individual Agency View (Abiodun, Drewal):
Primordial focus on maternal capacity, Carvers deploy active aesthetic innovation
female reproductive power, and agriculture. (ojú-onà), social commentary, and license.
1. Martial Heroism versus Maternal Fertility
- The Martial Reading: One school of interpretation links the dominance of equestrian figures (Jagunjagun) and armed warriors to the political realities of the nineteenth century . During this era, northeastern Yorùbáland was subjected to intensive slave-raiding incursions and military campaigns by the Fulani Emirate of Ìlọrin and the expansionist forces of Ìbàdàn. On this reading, Ẹpa superstructures developed primarily to honor local military leaders (Ọlọ́jọ́) who defended Èkìtì and Ìgbómìnà towns, celebrating physical valor and armed vigilance .
- The Fertility and Maternal Reading: Conversely, Rowland Abiodun, Henry Drewal, and John Pemberton emphasize the co-presence of female figures (Ìyá) holding infants, balanced alongside warriors or standing independently . They argue that the fundamental ritual concern of the masquerade is the preservation of life, agricultural increase, and maternal reproductive force (àṣẹ), with explicit links to deities of fertility and farming such as Òrìṣà Oko and Ẹ̀rìnlẹ̀ . The equestrian warrior is viewed not merely as a military agent, but as the physical protector of the maternal and productive power celebrated throughout the festival .
2. Individual Agency versus Communal Tradition
A second debate centers on the degree of artistic autonomy possessed by the traditional carver :
- Kevin Carroll argued that traditional Yorùbá religious sculptors operated strictly within communal norms, subordinating personal expressive impulse to the liturgical and iconographic requirements of the lineage or patron .
- Rowland Abiodun, Henry Drewal, and Roslyn Walker demonstrated that master carvers exercised notable license, introducing biting social commentary, novel compositional devices, and personalized visual metaphors (ojú-onà) . Through detailed stylistic analysis, these scholars proved that masters like Bámigbóyè and Olowe regularly challenged traditional conventions by altering proportions, detaching dynamic limbs from structural blocks, and reordering figurative hierarchies .
Chronology and Dating Limits
The dating of Ẹpa masks presents structural challenges in African art history:
- Material Deterioration: Ẹpa masks are carved from softwoods (Alstonia, Cordia, Ricinodendron) that degrade rapidly when exposed to tropical humidity, wood-boring insects, termites, and organic sacrificial libations such as palm oil, blood, and herbal infusions .
- Archaeological Silence: The historical and archaeological record is silent regarding the physical appearance, origin, and formal evolution of Ẹpa headdresses prior to the mid-nineteenth century . No pre-nineteenth-century wooden Ẹpa headdresses survive.
- Extant Chronological Window: With few exceptions, virtually all surviving Ẹpa masks preserved in museum collections and field shrines date between the late nineteenth and the mid-twentieth century . Stylistic chronologies rely on documented artist lifespans, lineage genealogies, and Western institutional acquisition dates rather than direct radiocarbon dating .
Key Museum Holdings and Provenance Records
Significant examples of Ẹpa, Ẹlẹ́fọ̀n, and Aguru masks are preserved in public institutions in Europe and North America, illustrating various modes of colonial and post-colonial acquisition.
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| INSTITUTION | CATALOGUE HOLDING |
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| The British Museum, | • Mask Af1964,02.1: Janus helmet mask with equestrian, |
| London | coll. before 1910 by Churchill Bryant in Òsì-Ìlọrin. |
| | • Mask Af1924,1220.1: Mounted warrior headdress, |
| | purchased 1924 (Wembley Empire Exhibition), Oye-Èkìtì. |
+───────────────────────────+───────────────────────────────────────────────────────────+
| Metropolitan Museum | • Accession 1978.412.402: Jagunjagun equestrian mask, |
| of Art, New York | attributed to Bámigbóyè / Bamboshe workshop. |
+───────────────────────────+───────────────────────────────────────────────────────────+
| Denver Art Museum, | • Accession 2006.27: Jagunjagun with captive mask, |
| Denver | attributed to Olowe of Ìsẹ̀ (c. 1860–1938). |
+───────────────────────────+───────────────────────────────────────────────────────────+
The British Museum (London)
- Mask Af1964,02.1: An Ẹpa (or Aguru) Janus-faced helmet mask topped by an equestrian figure and attendants . Collected before 1910 by Churchill Bryant in Òsì-Ìlọrin and transferred to the British Museum in 1964 from the Church Missionary Society . Curatorial research attributes this monumental carving to the workshop of Bamgbose of Òsì-Ìlọrin (d. c. 1920) .
- Mask Af1924,1220.1: An Ẹpa helmet mask featuring an armed rider and attendants, purchased in 1924 from Major C. T. Lawrence at the Nigerian Pavilion of the British Empire Exhibition at Wembley, London . The carving is stylistically localized to Oye-Èkìtì .
The Metropolitan Museum of Art (New York)
- Accession 1978.412.402: Epa Helmet Mask: Equestrian Figure (Jagun Jagun), dating to the late nineteenth or early twentieth century from the Èkìtì/Ìlá-Ọ̀ràngún border region . Acquired in 1960 by Nelson A. Rockefeller and gifted in 1978 as part of the Michael C. Rockefeller Memorial Collection, this work is attributed to the workshop of Bámigbóyè / Bamboshe .
Denver Art Museum
- Accession 2006.27: Epa Mask with Jagunjagun (Warrior) and Captive, attributed to Olowe of Ìsẹ̀ (c. 1860–1938) . Provenance records indicate acquisition from Africa Direct Inc. in 2006 . The superstructure displays Olowe's characteristic dynamic balance, forward-leaning posturing, and intricate spatial undercutting .
Provenance Gaps and Attribution Complexities
Institutional catalogue entries for Ẹpa headdresses reveal systemic documentation gaps :
- Omission of Primary Lineage Data: Masks collected during the colonial period by military officers, colonial administrators, traders, and missionary societies were frequently accessioned without recording the carver's name, the patron lineage (idílé), or the specific shrine from which the object was removed .
- Workshop Attribution Debates: Art historians face challenges in distinguishing the hand of a master sculptor from those of his senior apprentices or workshop assistants . In the Òsì-Ìlọrin and Odò-Ọwá workshops, where masters such as Bamgbose, Arẹògún, Bámigbóyè, and Bandele worked concurrently or in close succession, establishing precise boundaries of authorship requires close morphological analysis of facial conventions, carving depths, and tool marks .
Dispersal, Provenance, and the Restitution Discourse
The global dispersal of Ẹpa headdresses reflects the political and economic transformations of twentieth-century Nigeria .
Channels of Dispersal
- Missionary and Colonial Administrative Collecting: Early headdresses, such as those held by the Church Missionary Society and British colonial officers, left Nigeria through administrative, missionary, and educational circuits .
- Direct Commissions for Non-Ritual Patrons: Master carvers actively negotiated new economic landscapes. Bámigbóyè of Odò-Ọwá, for instance, accepted direct commissions from colonial administrators, educational institutions, and Western patrons, carving works intended specifically for secular display rather than shrine consecration .
- Commercial Art Market and Shrine Removals: In the post-World War II and post-independence periods, socioeconomic shifts, the expansion of world religions, and intense international art-market demand led to the sale or illicit removal of masks from ancestral family compounds and community shrines .
Legal Frameworks and Ethical Questions
The provenance of Ẹpa masks in Western collections is subject to legal and ethical scrutiny :
- Nigerian Antiquities Legislation: Nigeria enacted the Antiquities Ordinance of 1953 and the National Commission for Museums and Monuments (NCMM) Decree of 1979 to prevent the unauthorized export of historical cultural property . Masks extracted and exported after these statutory dates without explicit NCMM permits violate Nigerian national law .
- Differentiating Commission from Extraction: Contemporary restitution research emphasizes distinguishing between objects produced for external commission and those extracted through looting or distress sales during periods of economic vulnerability .
- Community Lineage Emblems: Restitution claims increasingly draw upon photographic archives, regional praise poetry (oríkì), and lineage scarification patterns recorded on the superstructure figures to identify the exact ancestral compounds and towns to which disputed masks belong .
History and evolution
The Ẹpa tradition originated in the northeastern Yorùbá hinterland of Èkìtì and Ìgbómìnà as an ancestral and civic masking ritual centered on communal well-being and fertility . While early documented records of physical masks date only from the nineteenth century due to the perishable nature of wood, the ritual framework reflects ancient northeastern traditions that remained distinct from the metropolitan court arts of the Ọ̀yọ́ Empire . As Ọ̀yọ́ influence waxed and waned in the eighteenth century, northeastern communities maintained localized masquerade lineages rather than adopting the centralizing royal masquerades of the western kingdoms .
The nineteenth-century Yorùbá wars, marked by Fulani cavalry raids from the Ìlọrin Emirate and military incursions from Ìbàdàn, fundamentally altered Ẹpa iconography . Communities adapted the headdresses to celebrate local war captains (ọlọ́jọ́) and mounted defenders (jagunjagun), embedding martial defense alongside ancestral fertility .
British colonial conquest in the late nineteenth century and the arrival of Christian missionaries brought deep disruptions . Missionaries attacked Ẹpa performances as pagan idolatry, leading to the destruction, abandonment, or sale of numerous ancestral carvings . Simultaneously, colonial exhibitions created alternative markets for master carvers like Bámigbóyè, who began producing secular works for British patrons .
Following Nigerian independence in 1960, rural-to-urban migration, economic strain, and the spread of evangelical Christianity and Islam further curtailed festival participation, accelerating the commodification and theft of sacred masks for the international art market . Today, Ẹpa festivals persist in a reduced number of Èkìtì and Ìgbómìnà towns as vibrant civic pageants reinforcing local identity . In the Atlantic diaspora, Ẹpa iconography has been reimagined in museum retrospectives, academic scholarship, and contemporary African diasporic art across the Americas, where the monumental warrior and maternal forms serve as enduring symbols of Yorùbá cultural resilience .
Fuentes
- [1]Henry John Drewal, John Pemberton III, and Rowland Abiodun, Yorùbá: Nine Centuries of African Art and Thought (New York: Harry N. Abrams / The Center for African Art, 1989), pp. 189–202.
- [2]Rowland Abiodun, Henry J. Drewal, and John Pemberton III (eds.), The Yoruba Artist: New Theoretical Perspectives on African Arts (Washington, D.C.: Smithsonian Institution Press, 1994), pp. 69–114.
- [3]William Fagg and John Pemberton III, Yoruba: Sculpture of West Africa, ed. Bryce Holcombe (New York: Alfred A. Knopf, 1982), pp. 40–56.
- [4]William Fagg and John Pemberton III, Yoruba: Sculpture of West Africa (New York: Alfred A. Knopf, 1982), pp. 168–174.
- [5]Will Rea, "The Ẹpa Masquerades of Èkìtì: A Structural Approach," African Arts, Vol. 52, No. 3 (Cambridge: MIT Press / UCLA James S. Coleman African Studies Center, 2019), pp. 42–55.
- [6]Kevin Carroll, Yoruba Religious Carving: Pagan & Christian Sculpture in Nigeria & Dahomey (London: Geoffrey Chapman, 1967), pp. 54–82.
- [7]Roslyn Adele Walker, Olowe of Ise: A Yoruba Sculptor to Kings (Washington, D.C.: National Museum of African Art, Smithsonian Institution Press, 1998), pp. 24–49, 112–115.
- [8]Felwine Sarr and Bénédicte Savoy, The Restitution of African Cultural Heritage: Toward a New Relational Ethics (Paris: Ministère de la Culture, 2018), pp. 32–45.
- [9]John Picton, catalogue entries 5.80 and 5.81, in Tom Phillips (ed.), Africa: The Art of a Continent (Munich/New York: Prestel / Royal Academy of Arts, 1995), p. 420.
- [10]Rowland Abiodun, Yoruba Art and Language: Seeking the African in African Art (Cambridge: Cambridge University Press, 2014), pp. 142–186.
- [11]Marsha V. Heyden, "The Epa Mask and Ceremony," African Arts, Vol. 10, No. 2 (Los Angeles: UCLA James S. Coleman African Studies Center, 1977), pp. 14–21, 91.
- [12]Wikipedia, Epa mask, https://en.wikipedia.org/wiki/Epa_mask