3D Photography (without glasses)
Jim Gasperini has discovered that it is possible to make stereoscopic images appear in 3D by making a two frame animation out of the left and right images. The results are surprisingly effective.
This is my probably my favourite of the examples on his page:
Interestingly, it seems the 3D effect is also visible to people who have lost sight in one eye, which can apparently be a powerful experience for such people.
