one day we might have drugs or techniques which can erase memories so you could forget seeing something, or we might develop invisibility cloaks (this has been done with tiny particles for very short time periods so far) so you don’t have to see something if you don’t want to!
You can make things invisible and you can erase memories, but whether you could actually ‘un-see’ something, I don’t know. I think sometimes if you have a really traumatic experience, your brain blocks those memories but I’m not sure that counts as ‘un-see-ing’ ?
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