Friday, December 4, 2020

Germany, Alfred Wegener postmark

Postmark commemorating the 90th anniversary of the death of German polar researcher Alfred Wegener. The stamp shows two shades of grey... or does it. It's suppose to be an optical illusion. The grey at the top is the same shade as the grey at the bottom. The white and black areas in the middle are supposed to trick your brain into thinking they are different.

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