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What is it?

Can you identify the object in this figure? Known as the Hallenbach figure, this illustration is hard to figure out from the paultry clues given.

However, once you get it, it's hard to ignore. Look at the whole picture at once and use the positive spaces as well as the negative spaces as clues.

Click here for the answer.

Credits: From Bruno Ernst's The Eye Beguiled - Optical Illusions. Taschen, 1989.

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