Pick a year:

1998:

1999:

Burning Man 2005

Burning Man 2006 (also the cigarette machine)

Burning Man 2007 (and Boof in action)

Burning Man 2008 Boofin

Burning Man 2009 Boof and Misfortune Teller

Burning Man 2010 Gizmotron of the Apocalypse