While I was randomly thinking, I saw that,
A 1D line is made up of infinite 0D points.
A 2D area is made up of infinite 1D lines.
A 3D volume is made up of infinite 2D areas.
So shouldn't a 4D figure be made with infinite 3D volumes? If this is true then Doraemon's pocket(which is 4 dimensional) can keep the entire observable universe, can't it? If that's true then wow
![Surprised :o](./images/smilies/icon_e_surprised.gif)