Is It Possible for a Brain to Have Sensations of Red?

i think we have a very strong tendency to agree with locke. The idea that colour is given in the mind seems counter intuitive. It's entirely logically possible for somebody to have sensations of red and ideas of red who has always been a brain ind a vat. You just have to stimulate the right part of the brain. That stimulation, in normal cases, comes from external objects but according to the brain in the vat, that's only contingent.