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Optical illusions have been intriguing us and driving us mad for as long as we can remember. Sometimes they happen organically. Other times, some brilliant mad scientist pulls off some sort of mind-melting image manipulation that leaves us a drooling mess. The later group is punctuated by entrants into the “Best Illusion of the Year” contest. Here are a few notable, mind-f*cking illusions that have won awards at the prestigious competition since its inception in 2005.