Untitled (Loan) (all works 2007), the first work viewers encountered in Kirsten Pieroth’s third solo show at Klosterfelde, comprised a vitrine and seven unframed photographs. An ironic examination of the international exhibition industry and its protocols, the images documented the Berlin-based artist’s contribution to “Learn to Read,” a group show at Tate Modern last fall. Pieroth had borrowed the wall label for the Mona Lisa from the Louvre in order to show it in London as an unassisted readymade, using this self-reflexive gesture to reenact the paradigmatic shift from work to frame (to borrow