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If I understand it correctly, Smalltalk is really nothing like Java and the mainstream OOP that Clojure is a reaction to.

Smalltalk is dynamic and Java is static.

Smalltalk, it is an experience, given that language, IDE and runtime/OS are all blended together, while Java can only do so much, even with the more advanced IDEs.

Clojure might be a reaction to C++/Java/C# OOP style, but it surely adopts Common Lisp OOP style.

I think if things have private state that can't be seen externally and that's idiomatic then there's a conflict, if not then there isn't. Do you think it's worth learning Smalltalk? Is it still possible?

Have a look at http://pharo.org/documentation (a modern smalltalk implementation), they have some good materials, also a discord server.

I think it's worth learning, even if you never use it.

Erlang and elixir.

Yeah that is why it supports a subset of CLOS.

You have to try it to really understand what OO actually is. Its not the OO you might be familiar with..