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The candle problem presents participants with a set of items, typically a candle, a book of matches, and a box of thumbtacks. The objective is to affix the candle to a wall in such a way that it will not drip wax onto the floor or table below.

The Candle Problem Setup

The solution to the candle problem requires overcoming functional fixedness by repurposing the thumbtack box. Instead of viewing it solely as a container for tacks, it must be seen as a potential shelf. The box is emptied, attached to the wall with a thumbtack, and the candle is then placed inside it.

Solution to the Candle Problem

A researcher presents a participant with a candle, a book of matches, and a box full of thumbtacks. The task is to affix the candle to a corkboard wall so that it burns without dripping wax on the floor. Based on the typical performance in this task, what is the most significant cognitive hurdle participants must overcome?

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