I picked this and two other similar cards up at the Hirshorn Museum in Washington, DC. The card has two parts held together by a rivet. You can rotate the top, plastic part for a special optical effect. By Ges. Geschutzt. (By the way, we almost missed the Hirshorn, which would have been a mistake! Even my kids were enjoying the modern art installations — and the gift shop help many treasures you don’t see elsewhere on the Mall!)
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