Or something. I don't know. I give up.
(,
Wed 13 Apr 2022, 22:17,
archived)
Invisible things do not reflect or project light. They behave as if they were not there at all, light passes through them.
White is composed of all visible frequencies of light. Key word here is 'visible.' White is kind of the most visible something can be, because it's reflecting or projecting all frequencies of visible light.
An invisible space could not be composed of visible frequencies of light. It would be transparent or dark, like regular space.
Like this:

Innit.
(,
Wed 13 Apr 2022, 22:20,
archived)
White is composed of all visible frequencies of light. Key word here is 'visible.' White is kind of the most visible something can be, because it's reflecting or projecting all frequencies of visible light.
An invisible space could not be composed of visible frequencies of light. It would be transparent or dark, like regular space.
Like this:

Innit.
Try looking at it from 90 degrees on your Y axis.
(,
Thu 14 Apr 2022, 18:03,
archived)
The visibility of a thing is defined by its apparent interaction with light (emission, reflection, refraction, distortion, absorption, occlusion, etc.).
An invisible thing does not apparently interact with light at all. It appears transparent, as if it wasn't there.
An invisible universe filled with invisible things would appear to us as black because it would be absent of visible light.
I assume Doppler shifted invisible light remains invisible in invisible space through all invisible time.
(,
Thu 14 Apr 2022, 22:11,
archived)
An invisible thing does not apparently interact with light at all. It appears transparent, as if it wasn't there.
An invisible universe filled with invisible things would appear to us as black because it would be absent of visible light.
I assume Doppler shifted invisible light remains invisible in invisible space through all invisible time.