According to Duchamp the artist … “does not really know what he is doing or why he is doing it. It is the spectator who, through a kind of “inner osmosis,” deciphers and interprets the work’s inner qualifications, relates them to the external world, and thus completes the creative cycle.” 1
The final work is thus created by the viewer who uses his/her analysis, perception and visual memory to creates the final narrative and meaning of the work. In this way the viewer becomes a witness to his/her own perceived reality.
1 NY Arts Magazine, Vol.6, No.12, December 2001 <http://www.nyartsmagazine.com/60/ethics.htm>