Moreover, in the same way that the old personal criticism was unable to account for the resemblance between the works of different individuals of the same school, so the theory of the environment fails to explain certain qualities possessed in common by various schools of art and various arts which have arisen under the pressure of different civilisations; and it is obliged to slur over the fact that the sculpture of the time of Pericles and Alexander, the painting of the early sixteenth century, and the music of the age of Handel, Haydn, and Mozart are all very much more like one another in their serene beauty than they are any of them like the other productions, artistic or human, of their environment. Behind this explanation there must therefore be another, not controverting the portion of truth it contains, but completing it by the recognition of a relation more intimate than that of the work of art with its environment: the relation of form and material. The perceptions of the artist, what he sees and how he sees it, can be transmitted to others only through processes as various as themselves: hair seen as colour is best imitated with paint, hair seen as form with twisted metal wire. It is as impossible to embody certain perceptions in some stages of handicraft as it would be to construct a complex machine in a rudimentary condition of mechanics. Certain modes of vision require certain methods of painting, and these require certain kinds of surface and pigment. Until these exist, a man may see correctly, but he cannot reproduce what he is seeing. In short, the work of art represents the meeting of a mode of seeing and feeling (determined partly by individual characteristics, partly by those of the age and country) and of a mode of treating materials, a craft which may itself be, like the mind of the artist, in a higher or lower stage of development. The early Greeks had little occasion to become skilful carvers of stone. Their buildings, which reproduced a very simple wooden structure, were ornamented with little more than the imitation of the original carpentering; for the Ionic order, poor as it is of ornament, came only later; and the Corinthian, which alone offered scope for variety and skill of carving, arose only when figure sculpture was mature. But the Greeks, being only just in the iron period (and iron, by the way, is the tool for stone), were great moulders of clay and casters of metal. The things which later ages made of iron, stone, or wood, they made of clay or bronze. The thousands of exquisite utensils, weapons, and toys in our museums make this apparent; from the bronze greaves delicately modelled like the legs they were to cover, to the earthenware dolls, little Venuses, exquisitely dainty, with articulated legs and go-carts.