Answer:
Encourage functional fixedness
Explanation
Functional fixedness is the tendency to think of things only in terms of their usual functions that is judging the likelihood of things in terms of how well they seem to represent or match.
Example include for instance, You have two candles, numerous thumbtacks, and a box of matches and many people might immediately start trying to use the thumbtacks to affix the candles to the wall but due to functional fixedness, you might think of only one way to directly use the thumbtacks.