From Wiktionary, the free dictionary
From post- + viewing.
postviewing (not comparable)
- After a viewing.
2007 October 29, Alastair Macaulay, “An Ephemeral Portrait of an Artist in a Hall of Mirrors”, in New York Times[1]:Bah. Though to delve further into its postviewing meanings may be food for cleverness, C. to C. is at no point remarkably interesting as movement.