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Some yogis try to tranquillize the mind by practising the gazing exercise. They mark a black point on a white wall, or draw a black circle on the wall, and then sit down opposite it so that their eyes are exactly opposite. The body is kept quite still and they continually stare at the mark for as long as their experience or their teacher prescribes.
-- Notebooks Category 4: Elementary Meditation > Chapter 5 : Visualizations, Symbols > # 8