The Guggenheim has been blurring the boundaries of what makes a traditional museum lately, and among their latest forays into the streets of New York is stillspotting nyc, a series investigating urban life (a previous program, Sanitorium, explored what keeps city dwellers sane as they rush about their hectic lives). Now, The Mute Button, a collaboration between the Guggenheim and Improv Everywhere, continues this trend by staging 23 under-cover actors and two dogs at the entrance to Prospect Park at Grand Army Plaza. The troup is a noisy bunch, until–presto!–the din of the city turns silent. A camera was on hand to catch the reactions of befuddled passers by. (Via Gothamist.)