I would go even one farther: There is, in principle, no way to find out. At any level description, it's still always possible to ask whether there is an even de

I would go even one farther: There is, in principle, no way to find out. At any level description, it's still always possible to ask whether there is an even deeper level of description, whether there are yet more undiscovered entities, etc. How would you ever know when you've reached 'the end'? While our scientific models are clearly in some sense about The World, they are still just models, and as dependent on the properties of our own minds as they are on the World. Some sort of direct-knowledge of The World is a nebulous concept. I think many people have made this point, but it is perhaps most associated with the philosophy Immanuel Kant, who made the distinction between noumena, or 'the-world-in-itself', and phenomena, 'the-world-for-us'.