12 RECTANGLES INTERSECTING REGULARLY BY THREES, AND INTERLACED BY THEIR SMALLER SIDES, THEIR EXTREMITIES, PENETRATING, FORMING THREE PAIRS OF PENTAGONS.
PLATE LXXIII.
Lintel of a Doorway.
13 FROM THE APICES OF TRIANGLES OF DIVISION DESCRIBE CIRCUMFERENCES; DIVIDE THE CIRCUMFERENCES IN TWELVE EQUAL PARTS, AND TAKE THE DIAGONALS OF FIVE IN FIVE DIVISIONS; THUS STARS OF SIX POINTS ARE OBTAINED. THESE STARS CONTAIN IN THE ENCLOSURE A HEXAGON OF TERNARY SYMMETRY, WITH ANGLES ALTERNATELY RIGHT AND OBTUSE.