The masons who had inadvertently hoisted too large a block, no longer troubled themselves to lower it back again, but worked it into the building in one or other of the ways before mentioned.

The architect neglected to duly supervise the dressing and placing of the blocks.

He allowed the courses to vary, and the vertical joints, two or three deep, to come one over the other.

The rough work done, the masons dressed down the stone, reworked the joints, and overlaid the whole with a coat of cement or stucco, coloured to match the material, which concealed the faults of the real work.

The walls rarely end with a sharp edge.