The Monad is an idea that is purely mental, totally immaterial, unable to communicate or be communicated to.
A Monad is a sort of mental substance or soul, characterized by its perceptions (in the widest sense of 'perception').
A Monad is a self-unfolding perception requiring no shared space or shared time. Through it, a world is perceived and unfolded without the assumption or presupposition of perception in general.
The Monad is crystallized thought... that is, thought stopped in a configuration pregnant with tension. It is thought as a messianic cessation of happening, or, put differently, it is thought qua revolutionary chance in the fight for an oppressed past.
A Monad is nothing but a simple substance that enters into composites simple, that is, indivisible, without parts, without extension, and without shape.