To be fluent is to flow. To be able to achieve a Csíkszentmihályian state of flow (cheek-sent-me-hi-lian). I suspect this to be more than a coincidence of terms.

Therefore, perhaps, to teach creativity, teach fluency. The ability to think natively in the terms of the field. To operate on concepts directly, without having to pop out to some alternate language to perform derivations. The flow state is said to be associated with reduced consciousness, but perhaps more accurate would be to say that it is consciousness made up of different terms and rules.

Applications: programming (I know several languages, but am fluent in Python), dance (eg fluency in galliard, canario, charleston, etc), music (improvisation and ornament), etc.

But how to teach fluency?