A simple way to learn the cross-eyed stereo view - X3D
The video has hidden and moving 3D objects. To see them unfocus
Aoi, 2D to 3D Stereoscopic Process Part 1
Viewing Side-by-Side Stereo Images - Ophthalmic Photographers' Society
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3D Stereoscopic Photography : 5 Steps (with Pictures) - Instructables
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Autostereogram - Wikipedia
Parallel versus cross-eyed stereo viewing – the swivel-eyed
3D Stereograms (not 'Magic Eye') - Page 2 - Astro Art, Books
Viewing Side-By-Side Stereo Images