The posters were placed (in a way mounted) on the fence of the Boston Common at the end of the march. These were collected by Dietmar Offenhuber, Nathan Felde, and Alessandra Renzi. Later on all of them were digitised (photographed). The entirety of this archive was made online, including the data that was created by manually tagging each of approximately 6000 posters. The project is still in progress. Check it out at http://artofthemarch.boston .