Artistic representation also, such as painting or music, though of a less articulate character, less dependent on purely linguistic convention and less limited by nationality, is still truly astonishing when intellectually regarded. An arrangement of pigments designed for the reception and modification and re-emission or reflexion of ether-tremors, in the one case; and, in the other, a continuous series of complicated vibrations excited by grossly mechanical means; intervene between the minds of painter and spectator, of composer and auditor, or, in more general terms, between agent and percipient,--again with possible great lapse of time. That ideas and feelings, thus indirectly and mechanically transmitted or stored, can affect the sensitive soul in unmistakable fashion, is a fact of experience; but that deposits in matter are competent to produce so purely psychic an effect can surely only be explained in terms of the potentialities and previous experience of the mind or soul itself. No emotional influence can be expressed, or rendered intelligible, in terms of matter. Matter is an indirect medium of communication between mind and mind. That direct telepathic intercourse should be able to occur between mind and mind, without all this intermediate physical mechanism, is therefore not really surprising. It has to be proved, no doubt, but the fact is intrinsically less puzzling than many of those other facts to which we have grown hardened by usage. Why should telepathy be unfamiliar to us? Why should it seem only an exceptional or occasional method of communication? There is probably, as M. Bergson has said, an evolutionary advantage in our present almost exclusive limitation to mechanical and physical methods of communication; for these are under muscular control and can be shut off. We can isolate ourselves from them, if not in a mechanical, then in a topographical manner: we can go away, out of range. We could not thus protect ourselves against insistent telepathy. Hence probably the practical usefulness of the inhibiting and abstracting power of the brain; a power which in some lunatics is permanently deficient.