There can be only one three... so here are the other photos I considered but ultimately rejected for this contest.
Click on any photo to view larger size.
Diffraction pattern from a CD balanced atop a coin stack
Veins of a leaf resized from 4800 dpi
Souvenir statue from Chichen Itza
Diffraction from overlapping CDs
Obverse side of an 1860 penny
Reverse side of an 1860 penny
