When Oliver Sacks first published my stereovision story as "Stereo Sue," he ended the article with my description of seeing a snowfall in 3D for the first time. Ever since then, I have wanted a snowfall stereogram. So, recently, I contacted Dmytro Bezsmertnyy (aka 3Dimka) of http://www.hidden-3d.com who made me a beautiful stereogram. I've now posted it on my website, www.stereosue.com. With a button click, you can even animate the stereogram and see the snowflakes falling.
Actually, the stereo snowfall is two steregrams in one. The background and the snowflakes each make up a wallpaper or floater stereogram. To see the depth in these images, look through the stereogram. For help with seeing stereograms, click here.
Wallpaper stereograms contain repeating patterns. When you look through the stereogram, one eye looks at a point in one pattern while the other eye looks at the same point in the adjacent but slightly different pattern. Your brain combines the image from each eye into a single scene seen in stereo depth. You may have experienced the same depth effect when looking at repeating patterns in a rug, on surface tiles, or on wallpaper.
