In "Envisioning the Invisible", Tim Chartier describes how the performing arts can be used to capture mathematical concepts in a visceral way that audiences can really connect with. Chartier is a mathematician and also a mime; he trained with the legendary Marcel Marceau. In one of Chartier's mime sketches, he gets the audience to visualize the one-dimensional number line as a rope of infinite length. The sketch begins with the lone mime walking toward the audience and suddenly stumbling. Peering down, he sees an (invisible) object on the floor and proceeds to slowly pick it up. Examining it, he discovers a rope of infinite length in both directions. He then engages in a tug-of-war with the rope and eventually cuts it into two, prompting the audience to ponder questions about the nature of infinity. In addition to describing several such mime pieces he performs (some of them together with his wife, who is also a trained mime), Chartier discusses the work of other mathematicians who work in such performing arts as dance, theater, juggling, and magic.