When if there is no umbrella stand, have you put your umbrella on a corner of a wall or hang on the doorknob?
When there is a hole like coin size in a good height, don’t you want to peep inside?

This kind of principle, it is called “Affordance” in design field. ITACCHO is consisted several cardboard sheets.

The first ITACCHO is just a plain cardboard sheet so there is no any trigger for doing something. As the number of holes on ITACCHO increases, you somehow understand "how to use it".

To understanding this kind of principle, the best way is actual experience which is very important.

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