Existence of reality
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The nature of Being is a perennial topic in metaphysics. For instance, Parmenides taught that reality was a single unchanging Being. The 20th century philosopher Heidegger thought previous philosophers have lost sight of the question of Being (qua Being) in favour of the questions of beings (existing things), so that a return to the Parmenidean approach was needed. An ontological catalogue is an attempt to list the fundamental constituents of reality. The question of whether or not existence is a predicate has been discussed since the Early Modern period, not least in relation to the ontological argument for the existence of God. Existence, that something is, has been contrasted with essence, the question of what something is. Reflections on the nature of the connection and distinction between existence and essence dates back to Aristotle's Metaphysics, and it found one of its later most influential interpretations in the ontology of the eleventh century metaphysician Avicenna (Ibn Sina). Since existence without essence seems blank, it is associated with nothingness by philosophers such as Hegel.
