Phil,
Geoff Shack writes about that in one of his books. I have read them all, and right now, I can't recall which one. I doubt he will mind if I just recommend you buy them all until you find the quote I am referencing, though.
When someone complains about a Biarritz swale I may have on one of my courses I always tell them its like a "CD" - there is substantial penalty for early withdrawal.
But yes, a sense of at least, whimsey, can show through in architecture, as can dead serious strict or proportional punishment, and a lot of other things.