Wayne Thiebaud, Cake Window (Seven Cakes), 1970-76 The guests at the royal wedding ended up eating fruit cake. Not most people's first choice, but certainly historically significant and appropriate. Our Neolithic ancestors ground up grains, added water, and cooked these 'oatcakes' on a hot stone. The ancient Egyptians, followed by the Greeks, also made cakes...which basically were fruit cakes: dense, bready creations made of dried fruits, honey, and nuts. The Romans, who often seem to have…