Italian artist Piero Golia and Swiss artist Fabian Marti conceived of their collaboration “Ruins, Regrets and Visible Effects” in an ingenious way: an exhibition on two levels, where the main attraction was the membrane joining the inner and outer areas of an elaborate installation—a liminal space reminiscent of a “third landscape,” a nether- world between natural environment and artificial construction, as formulated by landscape architect Gilles Clément. A twisting architecture of plywood arches, columns, and tunnels—designed by Marti in consultation with Golia—unraveled, like catacombs rising