Interesting, itchy, art

I was riding home on the bike trail along the river the other day, when I saw this bit of ephemeral botanical art by the side of the path:

I like it, but unless I am very much mistaken, the two inner circles are made from twisted bits of... poison ivy.

Somewhere in town, there is a very, very itchy artist. They'd better invest in some plant ID books if they are planning on becoming the next Andy Goldsworthy