How the hell do you get negative matter?

[RelentlessGarbage]

I have been told that already but I don’t know much on the matter on what it is or how you make it. Could you tell me?

My best guess? Start with low-level loaves, combine them to make denser loaves, combine those loaves to make even denser loaves...repeat ad nauseam until you get some truly ridiculous stuff.

I'm not sure if it matters what you start out with.