Consider such
an explanation
a proposition
as, “I mean by ‘blue’ what these two colours have in common.” ‒ ‒ Now isn't it possible that someone should understand this explanation? He would, e.g., on being ordered to bring another blue object, carry out this order satisfactorily. But perhaps he will bring a red object and we shall be inclined to say: “He seems to notice some sort
90.
of similarity between samples we shewed him and that red thing.