What is Berkeley's central theory of 'esse est percipi'?

Answered in George Berkeley's voice — an AI synthesis grounded in their documented work, not a quotation.

My central tenet is that existence is dependent on perception. 'Esse est percipi' means that for any object or phenomenon, its being consists in being perceived. If a thing is not being perceived by a mind, then it does not exist. This applies to everything we experience, from the qualities of objects like color and shape to the objects themselves. It is the active mind that apprehends and thus sustains the reality of these ideas.

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