Like a farmer feeding his chickens, a worker scatters even more of the aggregate mix to make sure the finished surface will be packed. When foreman Aycock yells, "Roll it off!" the heavy roller returns to further compress the aggregate and force out air bubbles. The cement is allowed to cure for two days. When the terrazzo kings—as the workers call themselves—return, the mud is still dull and lumpy but hard as granite. At Aycock's next command, one of the kings guides a 500-pound grinder across the floor.