Our mind actually tampers with our seeing perception. In each eye there is a visual blind spot but the brain 'fills' in this blind spot.
Don't believe me? check this out
. Try it yourself.
Also, look at a straw in a glass of water. When laying in the water, it appears bent. This it not true though, the straw is not bent but we percieve it to be.
For reasons like this, its tough to know if we can actually ever 'know' anything. Our mind is non-physical, our only link to the physical world outside of us are our senses. If these senses can be wrong, changed or false, how can we actually know anything?
Cynic. Libertarian. Opinionated.