the intrinsic quality of physical events

"the inferences that I can make as to the external causes of my experiences are only as to structure, not as to quality. The inferences that are warranted are those to be found in theoretical physics; they are abstract and mathematical and give no indication whatever as to the intrinsic character of physical objects.... we know nothing about the intrinsic quality of physical events except when these are mental events that we directly experience" (my emphasis) 
 
Bertrand Russell, Mind and Matter
 

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