What the outward appearance of these motte-castles was we learn from the Bayeux Tapestry, which gives us several instructive pictures of motte-castles existing in the 11th century at Dol, Rennes, Dinan, and Bayeux.[230] There is considerable variety in these pictures, and something no doubt must be ascribed to fancy; but all show the main features of a stockade round the top of the motte, enclosing a wooden tower, a ditch round the foot of the motte, with a bank on the counterscarp, and a stepped wooden bridge, up which horses were evidently trained to climb, leading across the moat to the stockade of the motte. In no case is the bailey distinctly depicted, but we may assume that it has been already taken, and that the horsemen are riding over it to the gate-house which (in the picture of Dinan) stands at the foot of the bridge. The towers appear to be square, but in the case of Rennes and Bayeux, are surmounted by a cupola roof. Decoration does not appear to be have been neglected, and the general appearance of the buildings, far from being of a makeshift character, must have been very picturesque. The picture of the building of the motte at Hastings shows only a stockade on top of the motte; this may be because the artist intended to represent the work as incomplete. What is remarkable about this picture is that the motte appears to be formed in layers of different materials. We might ascribe this to the fancy of the embroiderer, were it not that layers of this kind have occasionally been found in mottes which have been excavated or destroyed. Thus the motte at Carisbrook, which was opened in 1903, was found to be composed of alternate layers of large and small chalk rubble. In some cases, layers of stones have been found; in others (as at York and Burton) a motte formed of loose material has been cased in a sort of pie-crust of heavy clay. In the Castle Hill at Hallaton in Leicestershire layers of peat and hazel branches, as well as of clay and stone boulders, were found. But our information on this subject is too scanty to justify any generalisations as to the general construction of mottes.