A retrospective is, by its nature, a backward - looking form, putting on show that which has been, a condition that it shares with the basic material conditions of photography. (artforum.com)
... we seem compelled to recognize some reality which can not be itself described in strictly physical terms, however close the involvement may be with material conditions. (religion-online.org)
When material conditions change, changes are occurred in the adaptive culture. (slaw.ca)