To reach Otobong Nkanga’s exhibition, “Of Cords Curling around Mountains,” on the third floor of Castello di Rivoli, one first has to cross a footbridge overlooking the brick roof of the floors below. A voice beckons, singing a melancholy song, and before even entering the exhibition you are hit by a strong scent of mint, which almost instantly triggers memories and emotions tucked away in the recesses of the brain. Commissioned specifically for the galleries where it is installed, the show encourages viewers to slow down, to smell, to listen, to look. Thick black cords—handmade by artisans from