that picture is too funny. I grew up without TV so have never seen that but it's very cool. I had to look it up as I was wondering how come there were modern art fans in a cheesy '70's sit-com.
Then I came across this comment on a fan site: "The design is obviously inspired by Mondrian's Composizione 1921, but we never learn why a middle class family in Southern California was moved to create a rolling homage to Dutch proto-modernism." Couldn't have said it better myself. I still like the patterns though.