A massaginist.
And the thing about eyes, sight, and light is that nobody really knows what colour anything is.
What we think of as colour is actually light reflecting off a surface in the visible light spectrum- nothing is inherently colourful on its own. So everything we see is actually in our own heads. Transfered light is reflecting off objects, into our eyes and being read/perceived by the brain as 'colour'.
It's all a pigment of our imagination.
Dad: "Where does a General keep his Armies?"
Child/Teen/Adult me for the sake of the joke: "Where?"
Dad: "Up his Sleevies"
Admittedly for the first 3-4 years I heard this as a child I didn't get it at all but still rolled around laughing at how much my dad would laugh despite it's inherent oldness as a joke.
