Elon Musk believes that "machines that build the machines" are ultimately more important than whatever it is you're manufacturing. In his own work with Tesla and SpaceX, it's clear why Musk says this: ...

Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means "change in form". The protolith is subjected to heat and ...