I think Products affect human’s deep psyche. It’s too deep so often we can’t understand. 

Sometime commonsense about a product came from mistake of design. Long history of using miss-designed products built mental model inside of people’s mind.

Many people including me don’t realize it and use it without a doubt, but in rare cases a star designer realize it and make a new design. Then, if new design is bad, people don’t accept it, so it despair in the history, if it’s good people accept it with reluctance and gradually become popular.

From this thinking, I think of two things. One is that first design should be considered by long term thinking. The other is that we should know what is good design or bad design.