Would it be helpful for me to show you a real-life situation where the explicit use of negative colors is really important? Meaning, as an artist who believes -1 is the same as 0, you would never get anywhere. But as a magician fully comfortable with the color -1, you can do magic?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)