A discovery of twenty obsidian-inlaid ritual shields in a high-altitude cave in Peru has provided significant insight into the "Festival of the Solar Shield." These artifacts were used by the Chavin culture to reflect sunlight across deep mountain valleys during communal dances, a tradition that researchers believe was central to their winter solstice celebrations.
The shields are made of lightweight wood and covered in hundreds of tiny, polished obsidian mirrors. This find suggests that ancient Andean festivals used complex optical effects to create "miracles" of light, connecting the community to the sun god through visual spectacle and rhythmic movement that synchronized with the solar cycle.