Lies, It's All Lies.

Colour and sound do not exist. The physical variables that they are associated with (frequency of electromagnetic energy for colour, and frequency of physical vibration for sound) are coded for by the special electrical cells in the back of the eye, and the inner ear deep in the skull. These cells are connected end to end to make 'wires' which are then each insulated from each other by a special fat and bundled into nerves. Each cell only 'fires' in response to a particular frequency, so colour and sound are coded for in the nerves by which particular 'wires' conduct electricity to the brain. It's just those particular sensory cells which pick up specific energy forms that mean that the characteristics of incoming energy represent colour and pitch.

So, the world is really grey and silent.

Perhaps the moon would actually be a really interesting place to live if you had the right brain. Perhaps they should be studying retinal cells of penguins and polar bears to see if their eyes do pick up other types of visual variations in their environments, so it's not all white to them.

But wait.

Perhaps the brain spends the first two years of life correlating incoming electrical patterns to actual sensational experience (assuming colour and pitch ARE real after all, which, fortunately for our sanity, can never be proven. I think we are so fixed in our post-modern abandonment of reality that the idea of any absolutes freaks us out), and this is why there is such poor memory function up till then.
The frontal lobes can then begin, in response to the signals from the eye and ear, to automatically call up the neuronal activation patterns which represent the reality of colour and sound. This would leave the rest of the cortex to move on to other more abstract functions, like negotiating which tv channel the family will watch over dinner time.