How many skills went into the making of the tint and the kilns, into supplying the heat, the light and power, the belts, motors, and all the other things a mill requires?

• 制造颜料，烘干需要的热量，照明，电力，传动带，电动机，一家工厂所需要的一切设备，等等，所有这一切需要多少技能?工厂里的清洁工也算我的前身吗？