Absobox

The Absobox is a very large box, but it contains many more boxes than the others.

It contains every Universe possible or impossible. This means that every Universe is inside the Absobox.

Structure
The Absobox is made out of an outside which is solid, and inside there is completely full things. The Absobox has no empty space.

Quantum mechanics happen a lot in the Absobox, and even they don't have empty spaces. They are filled up with even smaller quantum-level objects. This is an infinite fractal.

Appearance
From the outside, the Absobox looks like a box, and then a mess of colour in the middle. While it looks like there is a lot of void, there isn't. These are just very very small objects that are invisible to the naked eye.