Nothing
This is plausible
Except if there’s zero things, there can’t be an equation either.
Therefore, nothing can’t exist. LoL.
Following that line of reasoning in a way that I can’t be arsed explaining, existence turns out to be a state that, once true, is always true, because its negation can never get a foothold to assert or instantiate itself.
Descartes was onto something!
p.s. a Tasmanian Tiger wasn’t a thing, it was a meta-thing. All the atoms in every Tasmanian Tiger, ever, are still in existence.
offshore westerly 