The Canon of Polykleitos

Polykleitos was a Greek sculptor who wrote about perfection in sculpture in his treatise titled Kanon – which means measure, rule, or law. The mathematical bases of artistic perfection.

Thanks to SANCTVS: https://www.youtube.com/channel/UCV6fyPJUk1vzWErYKZS3ogQ

https://en.wikipedia.org/wiki/Polykleitos
https://en.wikipedia.org/wiki/Aesthetic_canon