This image is from Ann Hamilton's soundless 13-minute video of a fingertip erasing a single letter of type from a pane of glass, then retracing that movement to print the letter again in reverse.
“Courier” features works by 11 artists from five countries, including the U.S., who “explore the physical, communicative and iconic properties of the typewriter,” but there is so much more than that to think about here, if one slows down enough to experience it. Mostly black-and-white, this is the kind of exhibit that doesn’t come to you, so you must go to it.