 Bergson’s third image is an elastic band being stretched. Bergson tells us first to contract the band to a mathematical point, which represents “the now” of our experience. Then, draw it out to make a line growing progressively longer. He warns us not to focus on the line but on the action which traces it. If we can focus on the action of tracing, then we can see that the movement — which is duration — is not only continuous and differentiating or heterogeneous, but also indivisible. We can always insert breaks into the spatial line that represents the motion, but the motion itself is indivisible. For Bergson, there is always a priority of movement over the things that move; the thing that moves is an abstraction from the movement. Now, the elastic band being stretched is a more exact image of duration. But, the image of the elastic is still, according to Bergson, incomplete. Why ? Because, for him, no image can represent duration. An image is immobile, while duration is “pure mobility” (The Creative Mind, p. 165). Later, in Creative Evolution, Bergson will criticize the new art of cinema for presenting immobile images of movement. As Deleuze will show in his cinema books, however, Bergson does not recognize the novelty of this artform. Cinema does provide moving images. In any case, in “Introduction to Metaphysics,” Bergson compares all three images: “the unrolling of our duration [the spool] in certain aspects resembles the unity of a movement which progresses [the elastic], in others, a multiplicity of states spreading out [the color-spectrum].” Now we can see that duration really consists in two characteristics:  unity and multiplicity. This double characteristic brings us to Bergson’s method of intuition.