Clock designed by George Nelson for Vitra. This clock is finished in natural beech wood and has a metal and wood structure. Today, their table and wall clocks remain a refreshing alternative to conventional clocks. George Nelson, 1948/60. Ball Clock in natural beech wood. In a wide variety of materials and sculptural forms, George Nelson's watches represent the state of mind of early 1950s society. The Vitra Design Museum is once again putting on sale a reissue of these coveted collector's designs, true to the original. Ball Clock, � 330 mm, finished in natural beech wood. Structure in metal and wood.