A little attention to physical details will be repaid by a lot of reward. If there are persistent, strident street noises or loud-speaking neighbours or radios to disturb him, the windows should be shut. If there is more than a grey soft dim light, the blinds or shutters should be half-drawn or half-closed. He is free to choose the position of the body as he likes, whether in a chair, on a couch, or on the floor; whether ordinary sitting or cross-legged squatting. Once his body is comfortably settled down he is free for the next step: to take his mind off his personal activities and put it on his spiritual aspirations.
-- Notebooks Category 4: Elementary Meditation > Chapter 2: Place and Condition > # 215