The Aalto vase’s undulating freeform silhouette — said to trace the shoreline of a Finnish lake — turns 90 this year, and MoMA’s exclusive NYC edition wraps it in an iridescent finish that shifts color with the viewing angle. Handcrafted in Finland at Iittala as a limited MoMA-exclusive run, it’s a proper collectible rather than a curio. The iridescent treatment is the only change to a form that has required no others in nine decades.