The philosophical system or ideology based on George Berkeley's theory that material objects don't exist independently of perception.
From 'Berkeleian' plus the noun suffix -ism, indicating a complete philosophical school or belief system.
Berkeleianism created one of the biggest 'gotcha' moments in philosophy—if a tree falls in the forest and nobody hears it, does it make a sound? Berkeley would say the tree itself isn't even real without a perceiver!
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