Rules

That’s why there’s rules, understand? So that you think before you break ’em.

Terry Pratchett, Thief of Time

The Dark

For something to exist, it has to have a position in time and space. And this explains why nine-tenths of the mass of the universe is unaccounted for. Nine-tenths of the universe is the knowledge of the position and direction of everything in the other tenth. Every atom has its biography, every star its file, every chemical exchange its equivalent of the inspector with a clipboard. It is unaccounted for because it is doing the accounting for the rest of it, and you cannot see the back of your own head. Nine-tenths of the universe, in fact, is the paperwork.

Terry Pratchett, Thief of Time