Caked in mud, bearing a lattice appendage of sticks attached to his back, wearing a headdress and a nylon mask, artist Kim Jones's alter ego Mudman began appearing on city streets, on the beach, and in galleries around Southern California in the 1970s. Jones emerged from the performance art movement, and the unsettling, itinerant figure of Mudman connected the abstract, formal investigations of process- and material-based artists with the intense...