Why can I visualize things into reality?

When I close my eyes I struggle to visualize things... but when my eyes are open i have more control. For split seconds I will see things materialize, but not with my eyes. It's hard to explain. I'll be seeing with my eyes while in my head I might see something else overlapped onto the same background. I don't have great control of it, it's mostly intrusive or creepy. When I was a kid I'd do it with cute or sweet things, i thought of it as daydreaming. Imagining a castle in the sky or dragons. but as I'm older it's more scary things, evil ghoul children or rats.

Why can I visualize things into reality?
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