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There are used in India, Tibet, and China meditation symbols of a purely geometric kind. They may be quite simple or quite intricate in design. They are drawn in black ink on white paper or parchment, or they are embroidered in coloured silk panels on tapestries, or they are painted directly on monastery walls. The designs include completed circles, perfect arcs, equilibrated triangles, rigid squares, pyramids, pentagons, sexagons, octagons, and rhomboids. It is believed that by concentrating on these geometric diagrams, with their straight undeviating lines, some help is obtained toward disciplining the senses, balancing the mind, and developing logicality of thought.
-- Notebooks Category 4: Elementary Meditation > Chapter 5 : Visualizations, Symbols > # 57