The explanation of the rarity of admirable though utterly eccentric experience is not difficult. The metaphorical remark that we are all branches of the same tree is its most compendious form. So much must be alike in the nature of all men, their situation in the world so much the same, and organisation building upon this basis must depend upon such similar processes, that variation both wide and successful is most unlikely. That we are apt to exaggerate the differences between men is well known. If we consider what is usually called mind, alone, we may well suppose that minds may differ _toto cœlo_, but if we look more carefully, taking account of the whole man, including his spinal reflexes for example, seeing his mind as but the most delicate and most advanced part of his total organisation, we shall not be tempted to think him so diverse. People of course do seem extraordinarily different in the ways in which they think and feel. But we are specialised to detect these differences. Further, we tend constantly to overlook differences in situation which would explain differences in behaviour. We assume to a ridiculous extent that what is stimulating us will stimulate others in the same way, forgetting that what will happen depends upon what has happened before and upon what is already happening within, about which we can usually know little. The ways then in which the artist will differ from the average will as a rule presuppose an immense degree of similarity. They will be further developments of organisations already well advanced in the majority. His variations will be confined to the newest, the most plastic, the least fixed part of the mind, the parts for which reorganisation is most easy. Thus his differences are far less serious obstacles to communication than, shall we say, such differences as divide the hypochondriac from the healthy. And, further, so far as they require reorganisation there will commonly be good reasons why this should be carried out. We should not forget that finer organisation is the most successful way of relieving strain, a fact of relevance in the theory of evolution. The new response will be more advantageous than the old, more successful in satisfying varied appetencies.