While watching session 408, about Protocol oriented programming, I kept asking myself why Dave appeared to leave the impression that POP is something different from OOP. Today I read a nice article about it, by Marcel Weiher, here.
[...] the idea was really to first get him all excited about not needing OOP, and then turn around and show him that all the things I had just shown him in fact were OOP. And still are, as a matter of fact. Always have been.
[...] The simple fact is that actual Object Oriented Programming is Protocol Oriented Programming, where Protocol means a set of messages that an object understands.
I think it's really worth the read.