What on earth is mereological nihilism (MN)?
From the wiki on Mereological nihilism
Mereological nihilism (also called compositional nihilism, or rarely simply nihilism) is the position that objects with proper parts do not exist (not only objects in space, but also objects existing in time do not have any temporal parts), and only basic building blocks without parts exist. Or, more succinctly, “nothing is a proper part of anything.”
That’s fascinating. There is more to consider:
A number of philosophers have argued that objects that have parts do not exist. The basis of their argument consists in claiming that our senses give us only foggy information about reality and thus they cannot be trusted; and for example, we fail to see the smallest building blocks that make up anything, and these smallest building blocks are individual and separate items that do not ever unify or come together into being non-individual. Thus they never compose anything. So, according to the concept of mereological nihilism, if the building blocks of reality never compose any whole items, then all of reality does not involve any whole items, even though we may think it does.
From the wiki on Paradox of the heap, an example of the Sorities paradox
1,000,000 grains of sand is a heap of sand (Premise 1)
A heap of sand minus one grain is still a heap. (Premise 2)
Repeated applications of Premise 2 (each time starting with one less grain), eventually forces one to accept the conclusion that a heap may be composed of just one grain of sand (and consequently, if one grain of sand is still a heap, then removing that one grain of sand to leave no grains at all still leaves a heap of sand, and indeed a negative number of grains also form a heap).
Peter Unger, a friend of MN, proposes the solution that heaps do not exist:
So the response must deny outright that there are such things as heaps. Peter Unger defends this solution.
Using the same logic, it can be shown that all wholes such as the universe, persons, cats etc., do not exist. All that exist are entities without parts.
From the same wiki on MN:
The only things we know of that do not have parts are the smallest items known to exist, such as leptons and quarks, which can’t be ‘seen’, so are not experienced—at least not directly. But indirectly through emergent properties. Thus all objects we experience have parts.
And, if quantum objects are vague objects, then ultimate reality is vagueness.