Four mouldings altogether are of this shape, two on each side, and beyond them towards the chapel is that arch or moulding which gives to the whole its most distinctive character. The great trefoil, with large cusps, which forms the head is crossed by another moulding in such a way as to become a cinquefoil, while the second moulding, like the hood of the door at Santarem, forms three large reversed cusps, each ending in splendid acanthus leaves. Further, the whole of these mouldings are on the inner side carved with a delicate spiral of ribbon and small balls, and on the outer with the same acanthus that runs up the jambs. Now, on the chapel side especially, from the base to the springing there is little that might not be found in late French Gothic work, except perhaps that diapered shafts were not then used in France, and that the bands of carving are rather different in spirit from French work; but as for the head, no opening of that size was made in France of so complicated and, it must be added, so unconstructional a shape. It is the _chef-d'oeuvre_ of the Manoelino style, and although a foreigner may be inclined at first, from its very strangeness, to call it Eastern, it is really only a true development in the hands of a real artist of what Manoelino was; an expression of Portugal's riches and power, and of the gradual assimilation of such Moors as still remained on this side the Straits. Of course it is easy to say that it is extravagant, overloaded and debased; and so it may be. Yet no one who sees it can help falling a victim to its fascination, for perhaps its only real fault is that the great cusps and finials are on rather too large a scale for the rest. Not even the greatest purist could help admiring the exquisite fineness of the carving--a fineness made possible by the limestone, very soft when new, which gradually hardens and grows to a lovely yellow with exposure to the air. No records tell us so, but considering the difference in style between the upper and the lower part it may perhaps be conjectured that the elder Matheus designed the lower part, and the younger the upper, after his father's death in 1515.