In philosophy and science both it is said that "Space & time exists only in our inner experience and not in reality". Whatever we cognize, it is the projection in our brain - the chemical and atomic reaction in our cells. This is the only way we can visualize anything in the World. What we cognize we conclude it is real.
When we are dreaming about a snake chasing, the feelings and bodily reactions are the same as real although nothing is real. But for the dreamer it is real in that moment till he wakes to consciousness.
For a colour blinded people, Green colour does not exist - does that mean Green colour is not there in the spectrum?
In essence 'Reality' is subtle and beyond human comprehension. We are like cockroaches who are not designed to understand all secrets of this creation and the creator. Thinking 'I know it all' is a stupid way of living and looking inward to search for the 'Reality' is the only way for Salvation.
With whole of my heart