Combining Texts

Ideas for 'fragments/reports', 'Human Knowledge: its scope and limits' and 'Fact, Fiction and Forecast (4th ed)'

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10. Modality / A. Necessity / 6. Logical Necessity
Some facts about experience feel like logical necessities [Russell]
     Full Idea: The impossibility of seeing two colours simultaneously in a given direction feels like a logical impossibility.
     From: Bertrand Russell (Human Knowledge: its scope and limits [1948], 9)
     A reaction: I presume all necessities feel equally necessary. If we distinguish necessities by what gives rise to them (a view I favour) then how strong they 'feel' will be irrelevant. We can see why Russell is puzzled by the phenomenon, though.