Optical Illusions
"Three in One"

3 Optical Illusions in one picture
Three squares drawn by Hans Kuiper in Reginald Neal's Optical Illusion "Square of Three"
The squares seem to be deformed due to the Zöllner-effect
The crossed lines seem to be deformed due to the Poggendorff-effect
This picture is copyrighted by Hans Kuiper
High resulution picture is available by the author

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