In the beginning there were the Machine Masters who roamed the universe looking for the perfect world upon which to create the perfect machine.
Earth, or as the Machine Master called it "Sphere" was perfect and had children call humans, which would appreciate the machines they would leave behind. They marvled over the abilities the hand made craftsmen showed, and the artistry of the human brain, and so they implanted the seed for the perfect marble making machine in the human consciousness.
So was the dawn of Machine Made Marble.
Rumor has is David McCoullough is still in contact with the Machine Masters!