On the left, Groucho Marx Art Car - Incognito Mobile
It is a representation of the floating head of Groucho Marx - The car's name is Incognito Mobile (NOT Mr. Potatohead!). Incognito was built by Kathleen and a team: Ericka (Sharpie). Trevor (Spankie Pie) (who were the primary master welders). Others involved: Tye (Uncle) , Sherri (Ivy), Arlon (light man extrodinaire), TJ, Kimberly (Harmony) and Lucy (Diamond).
Photo taken at the Burning Man 2012 festival (Black Rock Desert, Nevada).