 The philosophical task Ryle recommends involves tracing the inflections of significance that are conveyed by expressions with a common root in their various employments. On this way of looking at it, it is not wrong to say that the philosopher studies or investigates the idea or the concept of, say, justice. But putting it this way may be misleading if it obscures the fact that the logical force of the relevant expression “is just”) may change with the context in which it is used. Again, Ryle thought this to be so for most single words and complex expressions and not only the ambiguous “pun-words”. For, “[u]nnoticed systematic ambiguities are a common source of type-confusions and philosophic problems” (1945, 207).