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I find it odd that anyone who has read that book would write such an essay. He'd be aware that there is whole branch of philosophy dedicated aesthetics/quality and didn't touch on any of that either. Maybe cuz it was derived from a talk he gave and it had to be calibrated for a certain audience (definitely not philosophy students)

I was just about to comment this. It seems as though PG is saying taste (much like quality) is a perceptual experience[0].

[0] https://en.wikipedia.org/wiki/Pirsig%27s_Metaphysics_of_Qual...

My thought as well. He seems to be delving into the metaphysics of quality.