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?. Hong, 3 The term fa ? ('model') refers to a 'method', 'exemplar', 'norm', or 'law' for one to fa ('model') oneself upon to do something correctly. The 'sight' and the 'effigy' are thus different 'models' in the sense that 'road' and 'mountain' are different 'models' of bicycle adapted to different functions. 4 The term tuan ? ('modelling') refers to the action of 'moulding', 'modelling' or 'kneading' as concerns, in particular, round forms and materials like clay and glutinous food objects. Shen Gua is clearly using the term in a more abstract sense of instrumental and mathematical reproduction, pp.283-343281, 1966.