Post Modernists believe meaning cannot be determined by surface appearances since everything from a photograph to a television program is a text that must be decoded. The act of deciphering the “text” and unveiling the hidden assumptions behind it is what Jacques Derrida calls “deconstruction.” (Robert Hirsch, Seizing the Light: A History of Photography)
The notion that there is not a single truth of experience is at the core of postmodern thinking. That is in direct opposition to the modernist view of trying to discover the “essence” of essential meaning in the world." (Robert Hirsch, Seizing the Light: A History of Photography)
Postmodernism defines the name of the art movement of the second half of the 20th century. Postmodern photography is characterised by atypical compositions of subjects that are unconventional or sometimes absent. Postmodernist practitioners believe that one can still create art while ignoring “the rules”.
https://en.wikipedia.org/wiki/Postmodernism#Influence_on_art
http://art134.blogspot.com.au/2007/12/post-modern-photography-idea-before.html Demonstrate Photoshop stitching techniques