Metaphysics of Quality

• "Zen and the Art of Motorcycle Maintenance", Robert Pirsig's philosophical novel, 1974
• and expanded in Lila: An Inquiry into Morals (1991)
• ZAMM references the Sanskrit doctrine of Tat Tvam Asi or "Thou art that" which asserts an existential monism as opposed to the subject–object dualism
• Guidebook to Zen and the Art of Motorcycle Maintenance by Ron Di Santo and Tom Steele
• philosophical fiction
• greek concept of eudaimonia