miniblog.

Fun, accessible introduction to metaclasses in Ruby: https://dumas-olivier.medium.com/what-i-didnt-know-about-ruby-classes-9de64ee40d4d

Neat examples of GOOPS, the OO system in Guile (similar to CLOS): https://www.wedesoft.de/oop-with-goops.html (goes from rationale to demos and metaclasses!)

I like to have macros and metaclasses in a language. I prefer it when I don't have to use them.