Sky Umbrella Tibor Kalman, EFM, 1992 Humor and surprise are two of the designer Tibor Kalman's hallmarks, as witnessed by this view of a blue sky on a most probably gray day. MoMA's witty umbrella with an eternally cheerful sky is known and enjoyed throughout the world. Designed by EFM for the Museum with the cloud design by Mr. Kalman. Black nylon exterior; wood shaft and handle.