Job and Roel Wouters' film 1234567 is part of the If You Could Collaborate show in London, but you can also watch their Rainbowgun in action on CR Blog...

The brothers' weidly Rainbowgun consists of a set of handlebars with cylindrical holders for up to seven spray cans affixed to the front. Pressing the brake lever initiates the spray of paint. 

In 1234567, made especially for the If You Could Collaborate show, Job (aka Letman) and Roel take us through those very numbers – adding a can with each successive numeral. But which came first we wonder: the spray paint or the shirts?

Here's a shot of the Rainbowgun itself, snapped at the If You Could Collaborate show, which is on until January 23 at The A Foundation gallery, The Rochelle School, London E2 7ES:

The Rainbowgun was developed by Job Wouters and René Bakker. On the YouTube page featuring the 1234567 film, the Wouters write "Respect to Daniel Tagno who independently invented a similar tool in 2008".

Engineering: René Bakker
Music: Yvo Sprey & Friends
Yvo Sprey - Drums
Vicente Pino - Guitar
Lake Montgomery - Melodica
Sajosha Talirz - Bass
Simon Wald-Lasowski - Sax
Roel Wouters - Keyboard
Job Wouters - Piano
Music Recording by: Simon & Sajoscha
Rotoscoping: Hans Willem Gijzel
Location: Wittenplaats, Abel Roskam
Thanks to: Sal Kroonenberg, Cam-a-Lot, Karst-Janneke Rogaar, Rik Elstgeest