Just started playing with Clojure, and must say I'm really enjoying the
4Clojure site - big thanks to the authors!

One thing I have observed - bug report time - is that the ordering of the
tests is a bit weird. I've just done the "Simple Recursion" koan (id 57),
and the next test I'm being offered is "Function Composition" (id 58), and
the back option is "Sum it All Up" (id 24). This means jumping from
Elementary to Medium, or back to Easy...  I've noticed this is quite a lot
of the tests, again not a huge problem, but definitely not correct.

Or is this some kind of weird Lispy humour thing that I'll understand when
I've got a bit more experience under my belt?

Thanks for the feedback.  I can't quite remember how we order the problems,
but I believe it has to do with how many times its been solved.  Over time,
some of the problems we thought might have been more difficult (or at least
covered more advanced topics) ended up getting solved more easily, leading
to some confusing ordering.

We've never quite come up with a satisfactory way of ordering the problems
in general.  Maybe when you get more experience you can take a look at the
source and contribute a solution to this problem!