No, it’s not the glasses-cleaning machine or for that matter the Tenga. Rather, if it is raining, and you enter one of the fancier department stores, they put out a machine which allows you to very rapidly shrink wrap your umbrella. You just plunge your umbrella in and it takes about two seconds. The point is that you don’t drip water from your umbrella across the whole department store. Simple, no?
And if that doesn’t convince you to visit Japan, maybe Human Tetris will.