When I`m going to do a Christmas album I had to put my mind in Christmas mode. I had to go back to being a child and remembering all of that. When I go to do a project, I'm serious about it, so I wrap my world around it, and it becomes Christmastime for me and I'm singing songs like it's Christmas day.
There is a brain mechanism that works to identify colour differences directly, without first identifying the absolute colour of each surface. So on my view there is no reason to suppose anything like ten million colour responses to surface viewed singly.