To mark the historic event, the United States Postal Service is issuing an inspired postage stamp with a special trick.
Conceived by graphic designer Antonio Alcalá, the stamp features two layers of photographs. The first image depicts a picture of a total eclipse observed in Libya in 2006 by renowned astrophysicist Fred Espenak. Then, through the magic of thermachromic printing, an image of a full moon emerges when the warmth of your finger touches the black dot.
The commemorative stamp uses special temperature-sensitive inks that have also been used in mood rings, food labels, and color-changing Coors Light beer cans. On the back of the sheet of stamps is a map of the eclipse’s 70-mile shadow path, which will traverse 14 states as it moves east, from Oregon to South Carolina.
via {quartz}
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