 The structure of this argument seems clear. (1) There is an analogy or resemblance between the world and man-made machines in respect of their shared features of order, structure, harmony and the evident way that their parts are suited to perform some function or serve certain ends. (2) When we discover an object that has these features (i.e. order, structure, harmony, etc.) we infer that these objects have not just come together by chance. For example, if we discover a watch or a house our experience leads us to believe “that there is an original principle of order in mind, not in matter” (D, 2.14/146; cp. EU, 4.4/26; 5.7/45). (3) The principle that guides this inference is that similar effects must arise from similar causes. (4) It follows from these premises that we can (rationally) infer the existence of God and “his similarity to human mind and intelligence” (D, 2.5/143).