you can't believe this, but you can!
in the link below you will find 2 similar images, you need to cross your eyes till they become 3, if you see 4 images this mean you have crossed your eyes too much, just 3. and you will see the middle image in 3d.
http://www.physcip.uni-stuttgart.de/phy11733/stereo_e.html
now i must watch Avatar again without glasses :D
in the link below you will find 2 similar images, you need to cross your eyes till they become 3, if you see 4 images this mean you have crossed your eyes too much, just 3. and you will see the middle image in 3d.
http://www.physcip.uni-stuttgart.de/phy11733/stereo_e.html
now i must watch Avatar again without glasses :D