Interesting theory, except there's a flaw. What you're merely precieving as orange, is orange. In other words, it's just like saying "That's not orange! That's 'a secondary color that has been formed by the mixture of red and yellow pigments. '" Well, no, of course it's orange, you're only saying that it's different and giving the definition of orange. If you take it by your logic, everything is nothing, but what they're defined by, but if you take it by what I see it, everything IS what they're defined by. You catch my drift?
It's good to be open minded, but sometimes you have to be logical too.