Back home after having a thumping good time in London – not enough energy left to write up what we learned, but enough to poste a few pics to give a first impression. The game I started with my big crayons and a few circles was taken up by passers-by – like I hoped. It kept spreading and spreading, until it covered the whole square, and a little ways beyond.  I never expected it to grow so big! This had a couple of practical disadvantages, too, more to be said about this in another post. For now: photos.