 The picture he paints here is astonishing: as we see and touch the world—in particular, as one “moves the observing eye and the touching finger forwards and backwards”—not only do we generate an unfathomable manifold of visible and tangible representations at any time t, but each of these representations in turn produces a train of innumerable fading, graded fusions with all the others (SW VI: 90).  Thus innumerable series are generated and become interwoven (Weiss 1928: 92). The constantly generated perceptual representations gradually sink and shade away, fusing less and less with those trailing after (SW VI: 90). But at the slightest return (i.e., due to the finger or eye moving in reverse of its initial direction), all the earlier percepts, now aided by the very similar new-comers, begin to rise, which rising is associated with 