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Ideas from 'Natural Science (lost)' by Metrodorus (Chi) [340 BCE], by Theme Structure

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7. Existence / A. Nature of Existence / 6. Criterion for Existence
527 Everything exists which anyone perceives
                        Full Idea: Everything exists which anyone perceives.
                        From: Metrodorus (Chi) (Natural Science (lost) [c.340 BCE], B2), quoted by (who?) - where?
                        A reaction: cf Berkeley and Epicurus. This misses out the problem of perceptual error, such as a square tower looking round from a distance, or one person in a group thinking they have seen something. It is still a good criterion, though!