  Schlick’s new understanding of concept-formation allows him to seriously address the question of how the respective intuitive spaces of each of the senses are coordinated in the construction of a general intuitive space, which is not specific to any particular sense modality. The intuitive images of experience are spatially ordered, since they exhibit relative locations as well as spatial extension. In addition, since experiences occur one after another, they also exhibit an intuitive temporal order. This results in a distinct spatio-temporal ordering for each of the sense modalities, so that an intuitive order of smells, as well as an intuitive order of tastes (and so forth) are given in experience. The first step in the advance from purely subjective experiences to the transcendent reality of scientific objects is to coordinate the spatio-temporal frameworks of the distinct sense modalities. Thus, when a sore spot on one’s leg is touched by one’s forefinger, the feeling of the touch is accompanied by a visual image of the finger touching the leg. The coincidence of these two separate and distinct types of sensory data contributes evidence to the overall coordination of the spatio-temporal orders of the different sense modalities. This is the method of point-coincidences which Schlick applied to characterize the advance to knowledge of the transcendent world from the purely subjective domain of qualitative images. Of course, the idea of point-coincidences also plays a central role in General Relativity and it has generally been assumed that Schlick picked up the idea from his work on the new physics. But recent scholarship has demonstrated that, in fact, Schlick worked on the notion long before Einstein published the General Theory and may well have been Einstein’s source of the notion (Engler 2009, 135ff). The important point in the present context is that the coordination of a single individual’s sense modalities is but the first step in the construction of the transcendent order. The next phase consists of the coordination of point-coincidences among different individuals. If an instructor wishes to draw attention to some feature of a triangle on a blackboard at the front of a class, he points to the feature, thus effecting a point-coincidence between the tip of his finger and the feature of the triangle. And even though everyone witnessing the demonstration has a different perspective, what they all share is their observation of the point-coincidence of finger-tip and the geometric feature.  Further, it is to be noted that not every sensory point-coincidence is an objective one and it is generally true that not every objective point-coincidence is observed directly but is constructed or inferred from ones that are. Finally, all measurements, all determinations of space and time, are based on just such spatio-temporal point-coincidences (Schlick 2009, Sec. 31).