Being unable to see an object used for anything but its designed purpose is called:

1. Some obstacles to problem solving come from how the problem is framed. 2. Functional fixedness is a type of mental set. 3. In it you cannot perceive an object being used for something other than what it was designed for. 4. Seeing a coin as a screwdriver is exactly what functional fixedness prevents. _Source: OpenStax Psychology 2e (CC BY 4.0), Ch 7 'Thinking and Intelligence', sections 7.1-7.5_