The interesting thing to me about the footprints above, aside from their nature as photography fodder, is that they resemble the layout of the two intersecting paths at Winthrop Park, where I took the shot.
You can see the paths on Google Maps if you look for the intersection of JFK and Mt. Auburn in downtown Cambridge — one block south of Harvard Square (which isn’t), or you can hope that clicking on the “Link to this page” link for the park itself will work; but for some reason Google Maps (on this laptop, at least, in two different browsers) shows you the park while it’s loading, then jumps to another part of Cambridge. It’s 2:33am, however, and I’m not going to try to debug whatever I might be doing to cause that.
In any case, the pidgeon prints drew a map of the park paths.
The park is also Wintrop Square. Unlike most squares in Boston, it actually has corners that are right angles. It was the city’s original marketplace, and therefore dates, as does the city, from 1630. It was called Newtowne then. It became Cambridge eight years later.