BOX think outside

I find that lots of people are actually born in a box and never escape into the realms of creative thought.

Here's the perfect example :

Maybe some of you already know the Nine dots puzzle

It's to connect the dots by drawing four straight, continuous lines that pass through each of the nine dots, and never lifting the pencil from the paper.

Or the problem of the 7 Bridges of Konigsburg
(cross each bridge once and only once)

An excellent example of the process:
Japan : square melons improves packing density!