![Matteo Cainer courtesy of Architecture for Humanity](https://static.dezeen.com/uploads/2012/06/Matteo-Cainer-courtesy-of-A.jpg)
Architects donate work to charity auction
Dezeen Wire: Renzo Piano, Frank Gehry and Kengo Kuma are among more than 70 architects and designers who have donated drawings, paintings and other works to an auction for San Francisco-based charity Architecture for Humanity.
Buyers have until June 29 to bid on the lots, which range from sketches on the backs of napkins to watercolours and digital prints.