How many legendary graffiti spots can you name? Some are a matter of taste, but others are undisputed—Basquiat’s one-time studio until recently, for instance, Freeman’s Alley in the LES hopefully forever, but also Cortland Alley in TriBeCa, one of the fine art world’s latest hotspots. Ruttkowski;68, a German gallery with graffiti roots and eyes beyond art history’s canon, marks TriBeCa’s latest addition—in Cortland Alley too, that illegal art destination dating back to 1817.