In Leibniz’s Monadology, monads have no direct interaction with the external world, so there is no literal “human interface” with them. Any engagement is purely conceptual, through philosophical interpretation rather than physical interaction.but This question is outside my research focus, perhaps someone specializing in philosophy of mind or metaphysics could provide a better insight

Monads and Human Beings

In Leibniz's philosophy, human beings are also composed of monads. A human soul is a dominant monad, which perceives more clearly and distinctly than the others. The human body is a composite of other, subordinate monads, and the soul's perceptions of the body and the rest of the world are simply its own internal representations, perfectly aligned with the representations of all other monads. There is no physical or metaphysical interface that allows one monad to directly affect another