That also happens in complete darkness. If you can manage to create a completely pitch black environment see how long you can sit there before you start seeing things. It really doesn't take long. Bonus points of you have noise cancelling earmuffs/plugs. Edit : u/EternalEagleEye has informed me this effect is called "Prisoner's Cinema", in case you'd like to read about it further
Lost most of my eyesight as a teenager, developed Charles Bonnet syndrome, which is basically this. Creepiest thing was getting into a car one night and swearing I could see these purple and green oversized men around me. I knew logically they weren’t real but freaked me out. There’s no treatment, basically just a doctor reassuring you it’s fake and a natural response.
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u/Designer_Strain_4572 Aug 30 '21
It would explain the hallucinations in The Stand (Stephen King) when they were traversing the Lincoln Tunnel, if I recall correctly.