Final answer:
The nine-dot problem illustrates 'thinking outside the box,' encouraging creative thinking and insight in psychology by requiring one to draw lines beyond conventional boundaries.
Step-by-step explanation:
The nine-dot problem is a good illustration of thinking outside the box. This problem challenges your spatial reasoning skills and requires you to draw four connecting straight lines through all nine dots without lifting your pencil from the paper. The key to solving this puzzle is to realize that you can extend the lines beyond the square formed by the outer dots. This problem emphasizes the need to go beyond conventional boundaries and is often used as an example of creative thinking and the concept of insight in psychology.