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Вот, наверное, ответ. Смотрите на левой странице разворота внизу справа (подробности см. стр. 32-33):
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Текст со страницы:
THE MOSAIC PAVEMENT
THE MOSAIC PAVEMENT, OR CHECKERED FLOOR, HAS BLACK AND WHITE SQUARES, LIKE A CHESSBOARD. IT CAN BE SEEN ON THE floor in the centre of the lodge where its role is to make us think about opposites, how they contradict and complement each other. Apprentices are generally asked to study this subject. Masonic texts of the eighteenth century refer to the mosaic pavement as "Moses' pavement" or "the lodge's marvellous floor". In Pritchard's Masonry Dissected (1730), the mosaic square is considered to be both the floor of the lodge and the paving stones of the temple. Other texts claim: "It is the tiling on which the high priest walked in Solomon's temple." However, this allusion can be disputed, for the mosaic pavement does not have Hebraic origins.
It first appeared in the first century B.C. in Rome. At that time, the term was used for mosaics decorating natural or artificial caves, and fountains. Dedicated to the Muses, the nine goddesses of the arts, such places of rest and relaxation were called musaea. The decorations found here were known as musium opus, abbreviated to mussinum. This is where the word mosaic comes from, not to be confused with Moses. In the past, a tracing board would be drawn on the floor with chalk when work began. The modem tracing board is a painted canvas, and since it is rolled out onto the floor, it is often referred to as the carpet. It shows all the Masonic objects in the temple: two pillars topped with pomegranates framing a piece of rough stone, called ashlar; a square stone with a point; the Moon and the Sun; a square and compasses; a plumb line; a plumb rule; a gavel and chisel; and the trestle board. Around these symbols is a knotted rope. This is what the tracing boards of Apprentices would generally look like, but they vary according to the different degrees and rites.
The trestle board (shown below) shows the symbols which make up the letters of the Masonic alphabet. Letters are inscribed in geometrical figures, which in the past were used for writing inscriptions but today generally play a decorative role.