obligatory 6.6.06 post

stereograph, Devil's Canyon geysers, 1867

to view the stereograph without a stereoscope, cross your eyes while looking at the image. slowly relax them until the two images slide together, giving you a 3-D image. subjects are photographed by two cameras 2-2.5" apart, the approximate distance between a person's pupils.

a drawn stereograph. very cool.

raising suspicions with my google searches