Norman, if you go onto read the rest of my post, I was actually agreeing with you. I was cautioning against getting hung up on the word "prove" as a means not to take up your challenge to spell out why someone is thought to be creative. Just because someone's creativity may not be provable in the same, formal way as a mathematical proof doesn't mean one can get away with calling anyone they want "creative" without backing it up. I was suggesting that creativity has certain qualities and that those qualities could be looked for and enumerated with reference to the so-called creative person's work. Instead, what normally seems to occur is that the word "creative" gets tossed around like hot dogs at a picnic and loses all sense of meaning, purpose, and significance. Kind of like what happens to art in many circles. Everyone's an artist, so art loses in the end.