'Over nine seasons of the hit sitcom Seinfeld, there have been countless pop culture references, continuous themes, repeated jokes and innuendo. This diagram graphs these re-occurring themes and references over 180 episodes and 9 seasons. The diagram is displayed on a 1150x1000mm sheet of perspex.'

http://www.henryluong.net/#11281/Seinfeld
found via http://dadatata.tumblr.com