How important moving hands is! especially for designers. I realized that universal truth again by professor’s words.

On white paper or on computer display there are no human. Though we can write down human’s figure on them, we can’t always recognize them as a real human. It’s because they are not human, picture is just picture. On the other hand, if we made something like prototype model by moving hands, we can recognize it as if it is real. It’s because it exist surely.