The PDL art collective (Jason Puccinelli, Jed Dunkerley and Greg Lundgren) strikes again at Seattle's Olympic Sculpture Park.  At 12:30 PM on Sunday April 29th, a crew of workers in white overalls installed a swing set.  The accompanying sign boards read "Ouch! Even the lightest touch harms the art.  Scratches and residue cause major damage over time.   Help the art survive.  Please do not touch."  Within minutes, the crew was gone leaving a puzzled bicycle security guard shooing people away from the swing set.  By 2:30 PM, park officials had already removed the guerilla art installation.