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I see blobs of light when I close my eyes, they move and change color. Sometimes I find it interesting. (Happens more in the daylight, but it happens in darkness too.)

Sounds like tiny cuts on the eye, I have those too.. even when my eyes are open I can see that.
This is different. If I ask you to imagine an apple, can you see it? Video explain it quite well, along with the comments.

Ah, no I don't but that'd be an interesting condition to have.

I have always thought it was a figure of speech. But apparently some people just see things with their brain