Side by side with the paintings which deal with living form we find those painted ornaments which cover with their varied tints all the surfaces which are not occupied by the figure. This system of ornament went through a continual process of enrichment and complication. Its appearance in the early centuries is well shown in our two Plates, III. and IV.; the first shows the upper, the second the lower part of the western wall in the tomb of Ptah-hotep at Sakkarah. They confirm the ideas of Semper as to the origin of ornament.[355] That writer was the first to show that the basket-maker, the weaver, and the potter, originated by the mere play of their busy hands and implements those combinations of line and colour which the ornamentist turned to his own use when he had to decorate walls, cornices, and ceilings. The industries we have named are certainly older than the art of decoration, and the forms used by the latter can hardly have been transferred from it to mats, woven stuffs, and earthen vessels. In the regularity with which the lines and colours of early decoration are repeated it is easy to recognize the enforced arrangement of rushes, reeds, and flaxen threads, while chevrons and concentric circles are the obvious descendants of the marks traced by the finger or rude implement of the potter upon the soft clay. [355] SEMPER (G.), _Der Stil in den Technischen und Tektonischen Künsten, oder Praktische Æsthetik_. Munich, 1860-3, 2 vols. 8vo, with 22 plates, some coloured, and numerous engravings in the text. [Illustration: FIG. 282.--Vultures on a ceiling.] In these examples the intentions of the decorator are easily grasped. He has begun with a ground of rush-work, like that which is also found in the tomb of Ti.[356] In the compartments between the vertical bars he has imitated the appearance of mat walls, and of windows closed by the same contrivances (see Fig. 165). As if to prevent mistakes, he has been careful to introduce the cords, rings, and lath, by which the lower ends of the mats are kept in place. The design of the ornament is quite similar to those produced to this day by the basket or mat-maker. They are squares, lozenges, and chevrons. In the middle of the lozenges we find little crosses or circles of a different colour, which help to lighten the effect. Each mat has a red border at its lower end, which forms a satisfactory tailpiece, and unites it with the straight lath. There are narrow grooves between the mats in which the chains for drawing the latter up and down seem to be imitated. In any case, this latter detail is copied from the productions of one of the oldest of civilized industries--that of the blacksmith. [356] PRISSE, _Histoire de l'Art Égyptien_, text, p. 418. [Illustration: FRAGMENT OF WESTERN WALL IN TOMB OF PTAH-HOTEP Drawn in perspective to a scale of one half] [Illustration: FIGS. 283, 284.--Details from the tomb of Ptah-hotep.]