Performance art at Lovejoy Fountain

Yesterday I posted a picture of a fountain I found hidden away in Portland.  I'm still not sure but I think it is called Lovejoy Fountain.  Today, while walking past the same fountain after work, I noticed a few people acting strangely.  I eventually realized this was some sort of performance art thingy.  A few people were watching and it was difficult to tell who was watching and who was participating.  As far as I could tell, the actors were simply moving, feeling, expressing at will until one woman would blow on a tiny harmonica and they would freeze.  She would blow it again and they would continue.  Interesting.....