Observation in the park
After a three-day-observation of two benches in front of my house in Arnhem I discovered there are five different kind of persons using them. I made a different sign for every kind, and made a graph of these signs, in which one can see when different people use the bench during the day. Every minute the person stays at the bench, the sign turns one degree, so that one can see whether it is still the same person sitting there, or a new visitor.
I replaced this pattern at the benches.
