Scott Wayne Indiana, an artist in Portland, OR, realized that there are over 200 seemingly random brass rings embedded in different parts of the city.  They rings, which serve no purpose today, originated during a time when horses and horse carriages were tied to them in the 1800’s.

To reconnect people with their original use, Scott began “The Horse Project” - a public art installation in which people tie toy horses to the brass rings. 

You can learn more about it here.