Mexican sculpture, as soon as I found it, seemed to me true and right, perhaps because I at once hit on similarities in it with some eleventh-century carvings I had seen as a boy on Yorkshire churches. Its 'stoniness', by which I mean its truth to material, its tremendous power without loss of sensitiveness, its astonishing variety and fertility of form-invention and its approach to a full three-dimensional conception of form, makes it unsurpassed in my opinion by any other period of stone sculpture.