Originally, the Akapana was thought to have been developed from a modified hill. Twenty-first-century studies have shown that it is an entirely manmade earthen mound, faced with a mixture of large and small stone blocks. The dirt comprising Akapana appears to have been excavated from the "moat" that surrounds the site. The largest stone block within the Akapana, made of andesite, is estimated to weigh 65.7 tonnes. The structure was possibly for the shaman-puma relationship or transformation through shape shifting. Tenon puma and human heads stud the upper terraces.