Bildkörper is not a term describing a medium.
It describes states.

No separation of image, material, and space.
Only coupling under conditions.

The image does not appear as a surface.
It appears as a configuration.

Perception is part of the same system.
A field under pressure emerges.

The Bildkörper establish different regimes of the same inquiry.

Bildkörper do not stabilize form.
They shift conditions.