Originally published on http://www.polygon.com/2014/12/4/7335973/20-years-on-playstations-legacy-is-sophisticated-adult-style Within the febrile swamp of gaming history, just about every anniversary is met with droning songs of nostalgia, insectoid paeans to the past. But the joyful choirs that have met this week's celebration of the PlayStation's 20th birthday are merited.