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The cover image is taken from Milton F. Maritz and Marét Cloete’s article, “Analysis and Visualization of Fractional Reflections.” The image illustrates the m-th reflection bm of a vector b through a line V, spanned by a vector a, where m = 1.225. The vector bm can be decomposed into components b∥, parallel to a, and b⊥, orthogonal to a. When m is not an integer, is complex. The intermediate reflections of b through V are shown as shadow lines, as m increases from 0 to 1.225, sweeping out a cone around b∥.