Holographic Universe?

[Jimaz]

If you look through a magnifier at the color yellow on a CRT display you'll find it's made up of green and red. So which is it? Yellow or [[green and red)?

And yet if you look at, say, a lemon through the same magnifier, it's still yellow.

I read somewhere that, in philosophy, color is considered a secondary [[or tertiary?) attribute of an object. I think that means there's a subjective component to its perception. I guess that's how they explain that phenomenon.

It's still a head scratcher to me though.