Well, fantasy is a somewhat "loaded" word that I purposely use to make a point.

But if you think about it, you will see that the "natural" (i.e., naive) process of the mind is to use what it CONTAINS ALREADY to try to fit a new experience. That's...."fair enough" (really, what else can it do?), but it very often gives the wrong answer. What's useful, then, is to REALIZE THAT, and work on testing answers to separate "better ones" from not so good ones. That's the scientific process.

There is no built-in function of the human mind that delivers positively "correct" answers all the time. Hence, I said that what the human mind delivers is "fantasy." It's slightly loaded, but it's a useful description.

BTW, have a look at these STRIKING optical illusions!