 The image of the inverted cone occurs twice in the third chapter of Matter and Memory (pp. 152 and 162). The image of the cone is constructed with a plane and an inverted cone whose summit is inserted into the plane. The plane, “plane P,” as Bergson calls it, is the “plane of my actual representation of the universe.”  The cone “SAB,” of course, is supposed to symbolize memory, specifically, the true memory or regressive memory. At the cone’s base, “AB,” we have unconscious memories, the oldest surviving memories, which come forward spontaneously, for example, in dreams. As we descend, we have an indefinite number of different regions of the past ordered by their distance or nearness to the present. The second cone image represents these different regions with horizontal lines trisecting the cone. At the summit of the cone, “S,” we have the image of my body which is concentrated into a point, into the present perception. The summit is inserted into the plane and thus the image of my body “participates in the plane” of my actual representation of the universe.