constraint

The idiom thinking outside the box describes the ability to approach a problem from a different perspective instead of accepting its stated or assumed boundaries. It also requires to think differently and unconventionally, finding novel solutions simply by asking: "Wait, who said there was a box?" In design, creative thinking is often constrained by unvalidated assumptions that "box" us into what we believe the solution space is. The box isn’t real, yet it is treated as such and therefore triggers suboptimal choices and results.