"Optical illusion skull postcards were incredibly popular in the early 1900s in Europe," explains the popular @GotWeird account. "They were Vanitas or Memento Mori - Intended to cause the viewer to reflect on the inevitability of mortality and the consequent foolishness of all human ambition." And, yeah, these are certainly making me reflect on the inevitability of mortality more than that rotating horse ever did.
From penguins in space to floating planes, we've seen all manner of weird and wonderful optical illusions recently. For some of the best examples in one place, check out the best optical illusions of all time.
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