This famous riddle asks: What can go around the world without ever leaving its corner? The wording sounds like it must describe something that travels, but the answer is actually something that stays attached to one place.
The answer is a postage stamp.
A stamp sits in the corner of an envelope, yet the envelope can travel across cities, countries, and even around the world. The stamp goes everywhere the letter goes while remaining in the same corner of the envelope.
That is the wordplay behind the riddle. “Leaving its corner” makes you think of a corner in a room or on a street, but it really means the corner of an envelope. Once you picture a mailed letter, the answer becomes easy to see.
