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12. Knowledge Sources / B. Perception / 4. Sense Data / c. Unperceived sense-data

[the status of sense-data when not perceived]

3 ideas
We do not know whether sense-data exist as objects when they are not data [Russell]
Ungiven sense-data can no more exist than unmarried husbands [Russell]
'Sensibilia' are identical to sense-data, without actually being data for any mind [Russell]