American psychologist Joseph Jastrow published the optical illusion on the right in 1899. He used it to express how unconscious preferences help create a constructed reality. It's either a rabbit or a duck, depending on your point of view. The image on the left is going around the Internet today, and appears to be a sculpture inspired by Jastrow's illusion.
Link via Geekosystem
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if you have ever seen a rabbit or a duck you will notice that it looks like neither a rabbit nor a duck. it especially could not be a duck, the "beak" looks ridiculous.
i don't think this illusion has ever demonstrated any psychological effect other than that badly drawn images are hard to understand.
Like the mystery of the chicken and the egg, we finally have an answer! It is, in fact, a rabbit with a beak sticking out of its head! We will never be fooled again!