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ex-votos: 

an offering to a church in fulfillment of a vow

myth: 

A myth is a traditional, typically ancient story dealing with supernatural beings, ancestors, or heroes that serves as a fundamental type in the worldview of a people. A myth may explain aspects of the natural world or delineate the psychology, customs, or ideals of society

palette: 

small slab of stone used for grinding cosmetics in pre-dynastic Egyptian times; later, large ceremonial palettes bearing carved reliefs commemorated important events.

schist: 

any of various medium-grained to coarse-grained metamorphic rocks composed of laminated, often flaky parallel layers of chiefly micaceous minerals