Just wondering... Can you see stereoscopic photography without equipment, only with your eyes? I find it amazing how so many people can't... In fact in my school nobody believes me that I can see even the hardest ones without any problems, even those which have an inscription like "equipment needed for viewing". Basically, there are 2 types of stereo-photography: crossed eye and parallel eye. The crossed eye one typically gives better results and can be viewed in larger formats. Though I can easily see both, the parallel eye ones are clearly harder. The crossed eye ones imply focusing closer to yourself than you see the image, the parallel eye ones imply focusing further, beyond the image (like watching something infinitely far away). Basically, if you cross your eyes until 2 of the images meet in the middle (thus making a total of 3 images - normally they would be 4, resulting from the 2 on the screen that multiplied by 2 as you cross or "parellelize" your eyes), the image in the middle is going to be 3D! The results are amazing, IMHO. I know the physical explanation too, but I'm way too lazy to explain it now. So can you see them in 3D? Examples: Cross-eyed stereo photographies: Spoiler very large : Parallel-eyed stereo photos: ^ The last one is supposedly "extremely hard" without equipment.