Holographic art
Rudie Berkhout is a holographic artist. He has photographs of his exciting works on his website. To provide a 3D experience, he includes a page of stereo photographs of holograms in two formats: parallel-eyes and cross-eyed. By adjusting the parallax and focus of your eyes, two images can be fused into one in the brain. I find the cross-eyed images easier to view. As a note, this exercise causes eye fatigue, at least at first.
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