I too was always led to beleive that the inability to distinguish between red and green was the most common form of color blindness.

Obviously with red as phase and green as earth a transposition could be disastrous, but I've often wondered whether this has been over-emphasized. Maybe I've misinterpreted something, but I was under the impression that people suffering from red-green color blindness saw the two colors as being the same. If that's the case, then surely they wouldn't just guess at which is which? [Linked Image]