One of the first annual events to occur is the creation of a butter sculpture. Each year, a new Princess Kay of the Milky Way is selected to promote Minnesota's dairy industry. Part of the job involves posing for several hours in a walk-in, glass-walled refrigerator as a 90-pound (41 kg) block of butter is carved into a head with her likeness. Butter makers started sculpting their products at the fair as far back as 1898, although the head-sculpting tradition didn't begin until 1964.