I know that in order to smelt stuff, you need to heat it until it melts and then pour it into a form. But that oven and that form always need to have a higher melting point, right? So how do we create the oven at the top? How do we create stuff when nothing with a higher melting point exists to make an oven out of it?
Edit: I think I understand now, thank you again to the kind people in the replies who explained it to me 🙂