Since the late 1970s, when Richard Prince became known as a pioneer of appropriation art — photographing other photographs, usually from magazine ads, then enlarging and exhibiting them in galleries — the question has always hovered just outside the frames: What do the photographers who took the original pictures think of these pictures of their pictures, apotheosized into art but without their names anywhere in sight?
http://www.pdnpulse.com/2008/06/look3-video-sam.html
http://www.nytimes.com/2007/12/06/arts/design/06prin.html?_r=1&oref=slogin