I always feel a pinch of unease whenever someone begins busking on the subway. Part of this is born of a purely selfish anxiety, a personal calculation of whether I should compensate this performance or merely pretend that I’m not listening. But …

Papo Colo and Jeanette Ingberman founded Exit Art in 1982 as a space for “unusual” art, which is saying a lot given that this was a time when artists were bisecting public plazas with giant panels of unfinished steel, using subway trains as canva…