Did I just cause that to happen or did I just notice it whereas before I didn't notice it?

Does thought cause creation?

From Myst: The Book of Atrus:
 

"At first he had dismissed the notion as a foolish one. Of course they created these worlds. They had to be! How else would they come into being in such precise and predictable forms? Besides, it was simply not possible that an infinite supply of different worlds existed out there, waiting to be tapped. Yet the more he'd thought about it, the more he had come to question his father's simpler explanation."

Are we creating or merely 'linking in' to a pre-existing possibility?