Make your own Magic Eye picture. Pick a hidden shape, a sphere, heart, star, pyramid, spiral, or a word of your own, and this builds a single-image random-dot autostereogram of it on the spot, using the same technique as the posters from the nineties.
Relax your eyes, look through the screen rather than at it, and the shape lifts off the page in 3D.
Choose wall-eyed or cross-eyed viewing, pick a palette, and set how far the shape pops out. If you cannot find it, Peek at shape shows you what you are hunting for.
A free stereogram generator that runs in your browser, and the word version makes a good hidden message.
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