Untitled (Ripples)
US $1 note
glass, aluminum
275 X 340mm 2002

$1 cut into concentric circles about 1mm wide and arranged between seven layers of glass to create an effect like pond ripples. 

The glass isn't perfectly clear (it has a slight green tint) - so the deeper layers are slightly darker and greener which also adds to the sense of depth.

I assume this artwork would be illegal in the US (destroying currency).  I'm not in the US.