If you aren't a fan of Moomin Books
The Hattifatteners are tall, thin, ghost-like creatures.... They are constantly, silently and purposefully on the move. I am pretty sure there was a picture in one of the Moomin Books
I don’t understand much about kitesurfing, but my best quess is that the point is not so much going to and fro very fast (as in the last picture), but to do tricks. We observed a big bunch of wind- and kite-surfers yesterday on the Flag beach. It took me a while to figure out that one of them was doing something other than just turning and heading back into the deep almost every approach — a guy with lot of bright orange in both his kite and underside of the board.