Christian Marclay’s artwork The Clock - Part of the British Art Show 7

These are some pictures from the film that me and a friend went to go and see, it is a 24 hour film that shows a series of clocks through out the film showing the time that it is in the day.

First I didn't quite understand what the relevance this was then I realised that the whole point is that none of the footage is his own work and he has put a piece of "his" work together using other peoples films and claiming it to be his own.

Can he call this his piece of work?