 There is another respect in which Croce’s notion of expression as intuition departs from what we ordinarily think of in connection with the word ‘expression’. For example we think unreflectively of wailing as a natural expression of pain or grief; generally, we think of expressive behaviour or gestures as being caused, at least paradigmatically, by the underlying emotion or feelings. But Croce joins a long line of aestheticians in attempting a sharp distinction between this phenomenon and expression in art. Whereas the latter is the subject of aesthetics, the former is a topic for the natural sciences—‘for instance in Darwin’s enquiries into the expression of feeling in man and in the animals’ (PPH 265; cf. Aes. 21, 94–7). In an article he wrote for the Encyclopaedia Britannica, speaking of such ‘psychophysical phenomena’, he writes: