Monad (n.) have no windows because they need none: each already represents the whole universe inside its own capsule.
Monad (n.) is a living mirror of the universe — and this mirroring is no fixed copying but drives on toward new possibilities of itself.
Monad (n.) means the simple, the one, but also the solitary: what unifies originarily and individuates in advance.
Monad (n.) is a mundus concentratus: each concentrates the whole world in its driving, after its own fashion.
Monad (n.) does not need unifying; it is what gives unity — a metaphysical point, a "formal atom," not a smallest piece of matter but the indivisible principle of form.
Monad (n.) apprehends the whole world in its unity yet never comprehends it totally; each, at its level of awakeness, is a world history presenting the world, so that the universe is multiplied as many times as there are monads.