In fact, the arrangement seems mathematically and technically perfect. At all events, we know too little to criticize it. Yet one would much like to be told why it was not repeated by any other architect or in any other church. Apparently the Parisians themselves were not quite satisfied with it, since they altered it a hundred years later, in 1296, in order to build out chapels between the piers. As the architects of each new cathedral had, in the interval, insisted on apsidal chapels, one may venture to guess that the Paris scheme hampered the services. At Chartres the church services are Mary's own tastes; the church is Mary; and the chapels are her private rooms. She was not pleased with the arrangements made for her in her palace at Paris; they were too architectural; too regular and mathematical; too popular; too impersonal; and she rather abruptly ordered her architect at Chartres to go back to the old arrangement. The apse at Paris was hardly covered with its leading before the architect of Chartres adopted a totally new plan, which, according to Viollet-le-Duc, does him little credit, but which was plainly imposed on him, like the twelfth-century portal. Not only had it nothing of the mathematical correctness and precision of the Paris scheme, easy to understand and imitate, but it carried even a sort of violence--a wrench--in its system, as though the Virgin had said, with her grand Byzantine air:--I will it! [Illustration with caption: CHARTRES] "At Chartres," said Viollet-le-Duc, "the choir of the Cathedral presents a plan which does no great honour to its architect. There is want of accord between the circular apse and the parallel sides of the sanctuary; the spacings of the columns of the second collateral are loose (laches); the vaults quite poorly combined; and in spite of the great width of the spaces between the columns of the second aisle, the architect had still to narrow those between the interior columns."