[sol1x]

Every competition is one node, which itself has one leaf-node for each of its events. The dots disappear after some time and the competitors disappear if they are inactive (and come back if they are active again). I just wanted to show how many competitions there are (and where, the tree is structured by country (although the structure is of course not geographically correct in any way)) and how many people (and which) "move around" between those competitions. I think its very funny if you "follow" people like Lars or Ron, who attended many competitions (and therefore their icon almost never disappears ;-)).