what happens on stortorget between 14h and 15h?

I want to share with you some more images. As earlier, they are taken from the webcams on Stortorget and then layer by layer superimposed one on the another. This kind of transformation, give us an info of usage of this part of a square in specific time. Those images are all made between 14:00 and 15:00 each day from Friday 7.10.2011 up to Sunday 16.10.2011 and show how different usage of the space was in this time. On what depend the usage of this space? The weather, some events in the city, working hours, indivudual willingess to go there?