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" From a philosophical point of view, Leibniz's most interesting argument was that absolute space conflicted with what he called the principle of the identity of indiscernibles (PII). PII says that if two objects are indiscernible, then they are identical, i.e. they are really one and the same object. What does it mean to call two objects indiscernible? It means that no difference at all can be found between them--they have exactly the same attributes. So if PII is true, then any two genuinely distinct objects must differ in at least one of their attributes--otherwise they would be one, not two. PII is intuitively quite compelling. It certainly is not easy to find an example of two distinct objects that share all their attributes. Even two mass-produced factory goods will normally differ in innumerable ways, even if the differences cannot be detected with the naked eye.
Leibniz asks us to imagine two different universes, both containing exactly the same objects. In Universe One, each object occupies a particular location in absolute space.In Universe Two, each object has been shifted to a different location in absolute space, two miles to the east (for example). There would be no way of telling these two universes apart. For we cannot observe the position of an object in absolute space, as Newton himself admitted. All we can observe are the positions of objects relative to each other, and these would remain unchanged--for all objects are shifted by the same amount. No observations or experiments could ever reveal whether we lived in universe One or Two. "
― Samir Okasha , Philosophy of Science: A Very Short Introduction
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" I dispute the right of conservatives to be automatically complacent on these points. My own Marxist group took a consistently anti-Moscow line throughout the 'Cold War,' and was firm in its belief that that Soviet Union and its European empire could not last. Very few people believed that this was the case: The best known anti-Communist to advance the proposition was the great Robert Conquest, but he himself insists that part of the credit for such prescience goes to Orwell. More recently, a very exact prefiguration of the collapse of the USSR was offered by two German Marxists, one of them from the West (Hans Magnus Enzensberger) and one from the East (Rudolf Bahro, the accuracy of whose prediction was almost uncanny). I have never met an American conservative who has even heard of, let alone read, either of these authors. "
― Christopher Hitchens , Christopher Hitchens and His Critics: Terror, Iraq, and the Left