Amazing Early 20th-Century Optical Illusion Skull Postcards
Briefly

Intended to cause the viewer to reflect on the inevitability of mortality and the consequent foolishness of all human ambition.
One of the most well-liked optical illusions has always been the metamorphic skull. Artists and designers have been utilizing this type of image in postcards, comics, ads, and covers since the 19th century.
Read at Design You Trust
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