This one has a nice 3d effect to my eyes, where the dark blue on the left appears to be farther than the rest of the maze. Can someone explain? http://www.jan

This one has a nice 3d effect to my eyes, where the dark blue on the left appears to be farther than the rest of the maze. Can someone explain? http://www.janthor.com/maze/rainbowpath.32.32.1128433606.84.png http://www.janthor.com/maze/rainbowpath.32.32.1128433606.84.... Zoom in for a better effect