Is there a unified natural principle or theory of all things behind the natural phenomena that are observed in different disciplines and scattered? Or: Has humanity observed a super-disciplinary, universal law of universality? The chord language phenomenon has this feature. The chord language exists in the disciplines of music, painting, and meridian (the theory of oriental ancient medicine), and is used for semantic expressions such as time, space, life, and spirit. The basic form is: quantized discrete spectrum, open string, closed string, non-linear string and other chord semantics, which is a repeatable observation fact - chord language, quantum theory, string theory is an isomorphic system? Music and painting are chord language phenomena, with chord language characteristics of spectral forms: chords, tones, scales, etc., expressed separately: time and space, mathematical mutual: reverse-mirror relationship - music, painting language, but also physical, mathematical form, which is a problem for science, philosophy. Chord language is not only a spiritual phenomenon (music, painting), but also a physical phenomenon (discrete spectrum, string), observing chord language events, such as: music, painting, etc. - also observing physical events, it has spiritual-natural isomorphism, This is its philosophical significance: there is a certain natural principle and law between spirit and nature. The chord language is an ancient knowledge system. Its mathematical model can be traced back to the ancient Greek Pythagorean temperament. Through the gradual improvement of musicians of the past, the chord space semantics can be observed in the painting: open string, closed string, non-line Strings, Meridian (Oriental Ancient Medicine) observe the positive-negative (yin-yang) rules of chord language, which form the basis of observation of chord language and are verifiable facts.