[↖] I. E. Jewell – The Corona of 1900 {drawn from photograph} (1903); [↗] Alexander Calder – Many (1931); [+] Cameron Baxter – Figure 2.2 from A Comprehensive Guide to Navigating Parallel Dimensions (2010); [↙] Philip Ruxton, Inc. – Color Wheel from Color Secrets (1929); [↘] Man Ray – Yesterday (1930)

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