What is an arbitrary door?

Arbitrary door is a kind of prop. With it, you can leave the present space. Any place that any door can reach is any space with the earth as the center 10 light years.

It is the props displayed in the future world by the Japanese classic animation Doraemon Theater version of Nobita's secret props museum. Any door has a huge appearance, pink door frame and other different types of Nobita's secret props museum.

Source of terrier:

Arbitrary Gate (mbth: どこでもド?, alias: Random Gate, Ruyi Gate) is a prop displayed in Nobita's secret prop museum of Doraemon, a Japanese animation, and was made by Dr. Hartman.

It can leave the present space on the premise of knowing its present position, but it can't reach the bottom of the sea. The biggest drawback is that it cannot move in time.

Nobita and Doraemon basically use this prop for every big adventure. Its principle is to use hyperspace to connect two places together. You can also connect the exit of any door (space tunnel) with the exit of the time machine (time tunnel).

Application example:

1: I really want to have any door of Doraemon!

If only I had a door, I can go wherever I want.