This image is fairly simple - the only objects are a glass sphere, a purple sphere, and a
gold sphere. These are set inside a cube map, which is a set of 6 images representing a
"box" containing the whole scene. The gold sphere has also had a normal map applied to it,
which is applied like a texture and alters the surface normals of the sphere, causing it
to look like it has a bumpy surface. The color is actually just set to a simple yellow -
all of the shading is just done by the regular Phong model, working with the altered normals.