He had really interesting computational ideas about harmony. From The Nature of Order (2002) “As architects, builders, and artists, we are called upon constantly—every moment of the working day—to make judgments about relative harmony. We are constantly trying to make decisions about what is better and what is worse…”
Following this, he published a paper on “harmony-seeking computation” as an approach to optimize “wholeness.” He identified 15 elements of wholeness in designs that might be measured, like the presence of coherent centers, strong boundaries, local symmetries or roughness/imperfection. He proposes that “the harmony that is sought in these computations is indeed what we otherwise call ‘beauty’. But the result of harmony-seeking computations are not merely pretty or artistic. In most cases, they are also better functionally and technically.”
Alexander, Christopher "Harmony-Seeking Computations." International Journal of Unconventional Computing 4 (2008).
Following this, he published a paper on “harmony-seeking computation” as an approach to optimize “wholeness.” He identified 15 elements of wholeness in designs that might be measured, like the presence of coherent centers, strong boundaries, local symmetries or roughness/imperfection. He proposes that “the harmony that is sought in these computations is indeed what we otherwise call ‘beauty’. But the result of harmony-seeking computations are not merely pretty or artistic. In most cases, they are also better functionally and technically.”
Alexander, Christopher "Harmony-Seeking Computations." International Journal of Unconventional Computing 4 (2008).