[awkwarddaturtle]

That's true of any language. Even within the same language paradigm.

If you know C#/Java then learn C++ or vice versa and it'll affect the way you think about programming.

Or move on to different paradigms...

Go outside of the statically typed OO world and try out the dynamically typed OO languages like ruby or python.

Even better, learn a weakly typed procedural language like C ( lingua franca for CS ).

Or choose an architecture and learn some assembly. Now that will affect the way you think about programming.

Move out of onto a different domain altogether and try one of the flavors of a declarative language like SQL.

Learning a bit here and there of many different languages and paradigms will affect the way you think. Clojure isn't special.

You can even just stay within a framework and try to get a deep understanding of .Net language/IL/Framework Libraries/Runtime stack. Then you get into the debate of breadth vs depth. Should you learn one language/framework/paradigm exceptionally well or should you learn a bit about a lot of a lot languages/paradigms?