This artifact has multiple lights, including point lights in red, green, and blue; the colors in the shadows therefore reveal which lights are blocked by the rest of the model at which places. It also demonstrates the texture mapping (on the presents and the tiers of the tree) and adaptive antialias bells & whistles that I implemented. There is a lens positioned in front of the tree to demonstrate refraction, and a reflective sphere behind, to demonstrate reflection; light from the reflective sphere can be seen passing through the lens in the upper right corner.