Polaroid SX-70 film takes some minutes to dry or become solid. By manipulating the polaroid photo with a sharp stick it is possible to achieve a strange painterly look. There is no photoshop or computer manipulations in these photographs.
Rob Gardiner of NYCLondon, one of the black and white photoblogs I recently found, has a gallery based entirely on this technique, yielding some really cool effects. Being a fan of Impressionist painting (particularly Monet) I really like what Rob has done here. My favorites are:
But they’re all really fascinating.