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Perl is also another interesting language for learning the low-level details of OOP, since its default set of OOP features (as of Perl 5; this all changes in Perl 6) involves manually "blessing" some data structure into an object. Objects are thus just "blessed" data structures (and not just hash tables, either, though those are the most common), and methods are just subroutines that accept their object as their first argument.

Between Perl and Erlang, I think I've ended up learning way more about real object orientation than I did from my dabbling in C++ and Java.