Bach's "Maze of Harmony" constructs a "stacked" psychological experience in the hearts of listeners and performers through its recursive structure. This experience seems to shuttle through a maze, with twists and turns, willows shining brightly, and finally returning to the starting point, forming a cycle of "self pointing". This kind of "self reference" is not unique to music, it touches on the core of philosophy and mathematics. G ö del's incompleteness theorem, in formal language, reveals the boundary between life and non life, meaning and meaninglessness, and the key to this boundary is "self referential". From Wang Wei's "Walking to the end of the water, sitting and watching the clouds rise", to Su Shi's "Lushan Smoke and Rain Zhejiang Tide", to Escher's paintings, and even Satoshi Nakamoto's Bitcoin, they all express the profound meaning of "self reference" in their own languages. Self reference "means a self referential and self enclosed system, which is both a constraint and a breakthrough. In art, it is an exploration of form, a pursuit of infinity; In philosophy, it is a questioning of the essence of existence and a self construction of meaning. Bach's music is an elegant melody of this "self referential" philosophy.