You scream, we scream, we all scream for ice cream!  :)  Bump mapping of the ice cream, along with texture mapping of the walls and table, are utilized to make the objects more realistic.  You will care to note the elegant photographic analog - field of depth is responsible for the blur in the background.  Another distributed ray tracing technique is used to create the glossy reflections to add a more ceramic texture to the ice cream bowl.  Jittering is used in combination with these distributed ray tracing effects to eliminate aliasing.