Answer:
The candle problem is a classic problem in cognitive psychology that was first proposed by Gestalt psychologist Karl Duncker in 1945.
The problem involves a candle, a box of matches, and a box of tacks.
The objective is to attach the candle to the wall so that it can be lit without dripping wax onto the floor. The only materials provided are the candle, the box of matches, and the box of tacks.
The solution requires the person to empty the box of tacks, attach the box to the wall, and then use the tacks to attach the candle to the box.