On a quiet street northwest of Alexanderplatz, a series of ad hoc works by Lebanese-born artist Mazen Kerbaj hang in a gallery window. Prominent in the series, titled “Oil and Vinegar on Paper,” is a self-portrait, rendered on a map of Bologna below the hand-drawn heading “am I Lost.” The depiction is slap-dash cubism, approximating a figure refracted through a fractured prism. Typifying the irreverence of Kerbaj’s practice, these works ...