 The second image of qualitative multiplicity is the color spectrum. We saw in the first image of the spools that there is constant difference or heterogeneity. The color spectrum helps us understand this, since a color spectrum has a multiplicity of different shades or nuances of color. Here we have heterogeneity, but there is a drawback to this image as well. We lose the characteristic of continuity or unity since the spectrum has colors juxtaposed. As Bergson says, “pure duration excludes all idea of juxtaposition, reciprocal exteriority and extension” (The Creative Mind, p. 164).