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.
