The scene is a pyramid of reflective spheres on a checkerboard surface. The
spheres have a diffuse component of 0.8 for each field and a reflective
component of 0.9 for each field. Two point lights were used for the lighting,
one above the origin (the sphere in front), and one slightly up the axis.
The checkerboard is simulated via boxes, with a reflective component of 0.4.