wallpaper
n.— «ClearChannel just want’s you to keep the radio on for as long as possible. McDonaldsization makes each station attempt to sound the same always. Thus the stations adopt music that sounds the same as what listeners already are hearing. The buzzword is “wallpaper.”» —“Digital Media Consumer Rights Act; Re:More to do with” Slashdot Mar. 2, 2003. (source: Double-Tongued Dictionary)
Further reading
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Amid court-ordered busing in the 1970s, a middle-school teacher tried to distract her nervous students on the first day of class with this strange assignment: find a monarch caterpillar. The result? A memorable lesson in the miracle of metamorphosis...