'Optical O' is based on the popular 'O' series of stemless wine glasses and was designed by Maximilian J. Riedel. The decorated, machine-made tumbler of the stylish, yet subtly nostalgic glass collection are inspired by the glamorous Art Nouveau period and present a contrast to Riedel's purist, unadorned wine glasses. These glasses are perfect for cocktails, mixed drinks and soft drinks alike.