Discuss how and why do Postmodern designers incorporate signs and symbols into their work?

Discuss how and why do Postmodern designers incorporate signs and symbols into their work?

Robert Venturi and Denise Scott Brown famously embraced the Las Vegas strip, billboards, and roadside architecture. Using four examples, how and why do Postmodern designers incorporate signs and symbols into their work?

Please discuss how design has been approached differently through some of the various exhibitions we have studied this term—ranging from MoMA exhibitions to Design for Different Futures and/or Designing Motherhood.  Please use at least four examples.