If a room is over-narrow one way, it is curious how much the offending wall may be thrown back by little panels of looking-glass united by an oak or ebonised moulding. They look well about fifteen inches by ten in size; the effect of a new room with a kind of trellis partition is then obtained, often quite deceptive, and if the room be rather dark and the glass panels face the window, they act as powerfully as reflectors in illuminating the room. These little panels may be of plain or bevelled glass; the moulding should be broad enough to give the impression of sufficient strength for a trellis - say two and a half inches wide. Walls of mirroring were fashionable in the seventeenth century, but the mirrors were richly painted, as I shall later show. Ceilings of mirrorings were also made to tally with the walls, and they are, of course, a kind of wall.