About the Exhibition Gray Column was one of the largest sculptures De Wain Valentine ever cast with polyester resin―the material with which he worked through the 1960s and 1970s to create his dazzling Circles and Columns. This monumental, free-standing slab, measuring 12 feet high and 8 feet wide, will be displayed to the public for the first time. The exhibition From Start to Finish: De Wain Va..