Insight- AHA!
The unconscious awareness of the mental steps leading to a solution.
Insight is considered to be the production process of a relatively full-blown idea.
(intuition is considered to be a hunch while insight is more complete ).

Insights are experiences that seem to pop-up suddenly into our mind without forewarning.
Insight is recognized as one of the most important psychological phenomena in creative thinking.

When given the solution to an insight problem, especially after trying unsuccessfully to solve it, you may experience a sudden "aha!" reaction as one sees that the situation can be interpreted in more than one way. So long as you stay with your initial interpretation, based on past experience, the problem is unsolvable.
Changing the way you interpret the problem, the solution becomes easy.

Past experience can interfere with creative thinking.