Thirty-seven years ago, a succinct text work by Lawrence Weiner was stenciled onto an external wall of the old Guinness Brewery in Dublin. Two blocks of pale-blue, sans serif lettering—one in English, one in Irish—were applied to the dark, weathered brickwork of an imposing historical edifice. Elliptical couplets declared a nonconforming Conceptual artist’s complex interest in material solidity: STONE UPON STONE / UPON FALLEN STONE. Commissioned for the 1984 edition of the quadrennial Rosc exhibition—the title of the seminal series of international group shows staged in Ireland between 1967 and