"People think of travel, of movement, as a kind of reprieve from life. But they're wrong. Movement isn't a reprieve. There is no reprieve. Movement is our permanent state."

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Not bodies produce sensations, but element-complexes (sensation-complexes) constitute the bodies. When the physicist considers the bodies as the permanent reality, the 'elements' as the transient appearance, he does not realise that all 'bodies' are only mental symbols for element-complexes (sensation-complexes).

— Ernst Mach