gain a sensory or sensible meaning if they are used to structure sensory and sensible data.75 In that case, we are speaking of their epistemological importance, rather than of ontological status and meaning. Hägerström’s theory draws a definite distinction between logical and sensible difference. On the one hand, we have logical difference, which refers to the formal difference between different real concepts while on the other, we have sensible difference, which refers to the spatio-temporal difference between the different physical objects and members of a class.76 The different reasons for separating concepts and things from one another must not be made a subject of confusion. Since real concepts exclude one another on logical grounds and reasons rather than on a spatio-temporal basis, all concepts are, on the one hand, related to one another in a logical, formal manner.One the other hand, all sensible objects are related to one another on a spatio-temporal basis and they therefore exclude one another on a spatio-temporal basis.77 The existing triangles of our physical world do not, for example, exclude one another on a logical basis, but on a spatio-temporal basis - for the logical exclusion between the triangles is reserved for the geometrical concepts themselves.A concept, therefore, achieves reality on formal grounds while on the other hand an object achieves objective reality, existence on a spatio-temporal basis, by being an element in spatiotemporal reality. Concepts have indirect, subjective reality, while things have direct, objective reality.78 a ca l l f o r s c i e n t i f i c p u r i t y 193 2 . 6 di f fe rence, real i ty, and exi stence 75 Ibid., pp. 78-91. 76 Ibid., p. 86. 77 Ibid., pp. 96-98. 78 Cf. Konrad Marc-Wogau’s ontological scheme for concepts, see Marc-Wogau, Studier till Axel Hägerströms filosofi, p. 116.
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