If you look you cannot see me. And if you see me you cannot see anything else. I can make anything you want happen, but later everything goes back to normal. Guess What am I?
closed as too broad by singletee, Rand al'Thor, dennisdeems, GentlePurpleRain♦, Deusovi♦ Aug 27 '15 at 18:30
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You can make happen anything then, and are limited to what you see at that moment.
Could you be:
A Dream. You can't see your dreams when you are awake and 'looking', and when you are asleep and dreaming you can't 'look' to see anything else. In a dream you can be able to control what happens (Lucid dreaming), but once you wake up, everything is back to 'normal' (reality).
Building off of Mark's answer:
We can't really see daydreams, but when we daydream, we don't really see anything else. We daydream about what we want, but then get snapped back to reality.
In a similar vein to Mark N's answer, how about
If you look you cannot see me. And if you see me you cannot see anything else. I can make anything you want happen, but later everything goes back to normal.
If you look at the real world, you can't see your daydreams. If you 're living in a daydream, you can't see what's really going on. Anything can happen in a daydream, but when you snap out of it, life is normal again.
A dream. When you look, you open your eyes and the dream ends. When you are dreaming, you can't see anything else, as your eyes are closed. Anything can happen in a dream and when it's over, it's back to dull reality.
the inside of your eyelids? You can't see them when "looking", and you can't see anything else while you can see them. The visual deprivation makes it easier to imagine/see your fantasies!