Rebar's PARK(ing) Day prank in San Francisco

Eileen Parking
I've posted previously about San Francisco urban prankster group Rebar, who among other stunts converted a downtown parking space into a public park. (Link) Today, Rebar is celebrating PARK(ing) Day again, transforming several parking spaces into temporary parks, including the mayor's personal City Hall spot. Laughing Squid's Scott Beale is working out of Ritual Coffee Roasters today where the nearest parking space is now a little greener. As usual, Scott has the photo goods over at his blog.
Link to Laughing Squid, Link to PARK(ing) Day site

UPDATE: Rebar is also celebrating PARK(ing) Day in NYC. Link to Gothamist coverage (Thanks, Jeremy!)