Postmodernism sucks... discuss
...where we see Postmodern architecture related to the growing trend of realism in film (including cinematic pornography). Not exactly a parallel development, but more where realism in films opened up designers/architect's minds to a more realistic approach to designing buildings/environments. Prior to realism, most films were an adapted form of theater/stage production. Realism in film presented 'real' situations within 'real' settings. [Yes, there is the omnipresent irony of films themselves not being real to begin with.]
aside: Does anyone else remember the paparazzi catching Jackie O. after she saw I am Curious (yellow).
Outside the stage directions of the Modern Movement there is the quickly found serendipity of everyday living/experience, and this realm of no clear rules beyond the immediate context of the situation made it easy for (what Portoghesi called) 'the end of prohibitionism'.
Postmodern architecture would not have happened without a certain frame of mind, and that frame of mind was becoming more and more prevalent within films of the later 1960s and 1970s.
Strictly within architecture itself, Scully, in "How things got to be the way they are now," finds the genesis of Postmodern architecture with Kahn and Kahn's Beaux Arts education and Roman-ness (wrapped together via Piranesi's plan of the Campo Marzio).
It seems worth noting that the two most significant architects to come out of the 'Strada Novissima' are Frank Gehry and Rem Koolhaas/OMA.