Really! Watch this video to see how it works.
Wasn't that cool? This illusion was developed by Akiyoshi Kitaoka, a specialist in the field whose work we've featured previously.
-via TYWKIWDBI
P.S. If the lines still look curved, then ease up on the schnapps a bit.
Aaah!! Can't look at this illusion without getting an instant headache - had to quickly scroll past!
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