Many impossible figures are based upon a triagle consisting of three
angles of 90 degrees. In reality such a triagle doesn't exist.
A nice example is the famous work of the Dutchman M.C. Escher,
who often used these impossible triagles in his beautiful drawings.
Less known is the name of Reutersvärd from Sweden. He also created many "impossible figures". His work was used in Sweden as a base for a very nice stampcollection.
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