Full Idea
Nietzsche famously defines metaphysics as the division of one world into two; the unity of the mythical pre-philosophical experience of the world is sundered, with Plato, into being and seeming, reality and appearance, supersensible and sensible.
Gist of Idea
Metaphysics divided the old unified Greek world into two
Source
report of Friedrich Nietzsche (Beyond Good and Evil [1886]) by Simon Critchley - Continental Philosophy - V. Short Intro
Book Reference
Critchley,Simon: 'Continental Philosophy - Very Short Intro' [OUP 2001], p.92
A Reaction
(Critchley doesn't give a reference; Idea 2860 is close). This is the discredited status that metaphysics gradually acquired after Kant, but I see modern metaphysics as reuniting human thought by digging down to the foundations to reveal roots and links.
Related Idea
Idea 2860 The most boring and dangerous of all errors is Plato's invention of pure spirit and goodness [Nietzsche]