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I always thought there were three shapes: http://hubski.com/pub?id=11032
I'm trying to imagine this, why it is the flavor that determines shape. I wonder if it could be that "smooth" and more mellow favors are active in a more localized area of our mouth's taste buds, vs acidly things which "spike" out further geographically on the tongue and in the mouth. Maybe Chinese egg roll mustard which lives almost past the tongue and up in the lower sinuses would be even more Kiki than the sharp cheddar because of its literal geography to some extent.