The quote below is from “Zen Mind, Beginner’s Mind”.
I find it pertinent to our times, as it seems it’s becoming very common to think that art doesn’t need rules.

[…] perfect freedom is not found without some rules. People, especially young people, think that freedom is to do just what they want, that in Zen there is no need for rules. But it is absolutely necessary for us to have some rules. But this does not mean always to be under control. As long as you have rules, you have a chance for freedom. To try to obtain freedom without being aware of the rules means nothing. It is to acquire this perfect freedom that we practice zazen.