Stereogram

Scroll down to find the controls for generating a stereogram.
Select your secret message, the repeating icon tile, and maybe a caption. This takes a long time to render. Be patient especially if you are using a slow computer.

Then view by staring into the image. If you cross your eyes until a column of tiles overlaps another column, your secret message will pop from the canvas!

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Secret Message:
Secret Message:
Caption: Black White Red