This is not an article about Taoism but a short reflexion about how two conjugate rules, abstraction & application, which have some similarities with the Tao's

This is not an article about Taoism but a short reflexion about how two conjugate rules, abstraction & application, which have some similarities with the Tao's Yin/Yang, can be used to gently introduce a functional programming language in a few lines trying to avoid grey areas. More (serious) explanations can be seen in the links given at the end. I'm sorry if the title, a little provocative, has misled you.