The Candle Problem by Karl Duncker, 1945

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You are in a room with a table pushed against the wall.
On it is a box of thumbtacks, matches, and a candle.
You must fix and light a candle on a wall (a cork board) in a way so the candle wax won’t drip onto the table or floor below.

This is the classic Candle Problem developed by psychologist Karl Duncker in 1945

How do you complete this task?