The floor of the scene is a reflective square, with a bump map to
give it a ripple pattern.  The body of the lava lamp is made with two
sets of cones, one just slightly inside the other.  This simulates
the water inside a thin glass enclosure.  The blobs inside the lava
lamp are made with metaballs.  One set is texture mapped, and the other
is made by blending the materials given to each metaball, based on
the relatave field strengths at various points on the blob's surface.
The back wall is a combination of a bump map and a a texture map.  The	
texture map provides the blue diamonds, while the bump map provides
the grooves between the tiles.