G.K. Chesterton in Orthodoxy:
Greek heroes do not grin: but gargoyles do - because they are Christian. And when a Christian is pleased, he is (in the most exact sense) frightfully pleased; his pleasure is frightful. Christ prophesied the whole of Gothic architecture in that hour when nervous and respectable people (such people as now object to barrel organs) objected to the shouting of the gutter-snipes of Jerusalem. He said, If these were silent, the very stones would cry out. Under the impulse of His spirit arose like a clamorous chorus the facades of the mediaeval cathedrals, thronged with shouting faces and open mouths. The prophecy has fulfilled itself: the very stones cry out.
The photographs are of gargoyles on the Cathedral at Ely.