A child is born with no senses.
He can't see, can't hear, can't taste, can't touch, can't smell.
Now, suppose that he is hooked up to tubes and somehow fed intravenously for eighteen years.
Would this child have a single thought in his head?
If so, where would it come from?
Is not everything you know derived from your senses?
Does that mean that our world exist simply as the brain's reaction to what it senses?
Is all knowledge just impressions taken directly from our senses?
Does the world exist entirely in our minds?
What about the things we know exist, but we can't technically sense...like time?

Or is there something else, some other source, that interacts with us beyond what we can observe with our senses?

Weird.
Sorry about that.
Just distracted.