  Although it may well be that the most compelling evidence for the realist’s claim that motion (and other forms of change) feature in immediate experience is straightforwardly phenomenological – that’s just the way our experience seems to be – there are empirical findings in psychology and neuroscience which point in the same general direction. We have already encountered (in §3.1) the phi phenomenon (or ‘illusory motion’). In the simplest of cases – as observed by Plateau in 1850 and Exner in 1875 – what is in reality a pair of lights some distance apart flashing alternately, is perceived as a single light moving back and forth. A more dramatic (and ubiquitous) illustration of the same tendency is television and cinema, where a mere 25 frames per second suffices to produce a perception of smooth motion. It seems that when our visual systems are supplied with stimuli which are merely suggestive of movement they are eager to supply us with vivid experiences of motion itself. This is not all. Studies of the visual systems in the brain have revealed areas – in particular the region known as V5 – which specialize in motion-detection. Interestingly, the condition of cerebral akinetopsia, a form of motion-blindness, has been linked to damage in the V5 area. An afflicted patient, known as LM,