Data Ravelさんのイラストまとめ

One very commonly related to that is Pegasmon who normally creates an outer space inside of its wings (It's literally stated to carry the outer space within its wings in St-725).

Not every Digimon has its insides accessible with a zipper, Digitamamon is covered in an exoskeleton shaped like an egg, it's very powerful, but it's easy to access it's true form from the opening in the egg.

That is also in Wizarmon's cape and Fantomon's cape, that one is very interesting, because its insides are said to be connected to another dimension.

Looking at various Angewomon's artworks is possible to see what looks like a purple/blue/black space with some dots. That background is also seen in other Digimon

Yet some Digimon with zippers are seen as costumes, and the insides have another Digimon controlling it. What is really inside of there ? The answer is very interesting.

And since Digimon have no insides, if one would look inside of the zippers of a Digimon, there's nothing there. If you see Wizarmon, its cloth has lots of zippers. Some are closed, some are open, they can change at any time. In the end, they really don't matter.

And there's a interesting consequence to this nature of the Digimon. A design choice that Watanabe uses a lot in Digimon is that there are "zippers". He draws them as if they were teeth, and when it's opened, it looks like fangs from a mouth.

If one would look inside of a Digimon, it nothing in rendered, then it would see nothing inside of it. The insides of a Digimon only exists if the wireframe in rendered from the inside, something that isn't always there.

So, the arts with Ofanimon face ? It's not really there at first. Behind the "texture of a mask" is simply the wireframe, after the mask is removed, a face is rendered so humans can understand the Digimon.

The elements can also be related to the more abstract concepts that are the basis for the Digital World. Although some are very clear the elements themselves (Such as Light and Darkness) the relation between the elements and the Spiritual Traits are already well known.