Chindōgu is the Japanese art of inventing ingenious gadgets to solve everyday problems. However, they are often described as ‘unuseless’, as they cannot be regarded as ‘useless’ in an absolute sense, since they do actually solve a problem; however, in practical terms, they cannot positively be called ‘useful’. So when you combine this way of thinking with modern technology, you get an automated door that only opens to fit your size.

They say in the video that it’s good if you don’t want dust or wind to come through, but the door is probably cost more to develop than it will ever be worth.