A lot of floating "stones", 36 to be exact, although only 35 is visible. I used four different colored light sources to get a really special light effect on the set.
Personally I think the depth of field is the most fantastic part about this image, as it gives you a funky kinda feeling about where all those stones are positioned.
Modeled in 3D Studio Max and rendered with the Vray plugin.
Hope you enjoy it