OOP Without Classes?

I interviewed David West, the author of the Object Thinking book, a few weeks ago, and he said that classes were not meant to be in object-oriented programming at all. He actually said that earlier; I just didn't understand him then. The more I've thought about this, the more it appears obvious that we indeed do not need classes.

Battleship Potemkin (1925) by Sergei M. Eisenstein

Here is a prototype.

Let's say we have only types and objects. First, we define a type:

type Book { v...