These things are the subject of a “sphere” used in modified form for Johannes Itten’s Preliminary Course at the Bauhaus and designed by Philipp Otto Runge (10[1])(“ROON-guh”). J. M. W. Turner referenced an iconoclastic book about these things in the title of a painting that depicts the morning after the biblical flood. A triangle with nine segments that demonstrate these things is often named for Goethe (10[1])(“GUR-tuh”), who used symbolic labels like “unnecessary” (10[1])in his Theory of them. (10[2])Charles Blanc’s theories about these things (10[1])“mixing” in the eye (10[1])inspired Paul Signac (“seen-YAHK”) and Georges (10[1])Seurat (10[1])to develop Pointillism. Harlequins (10[1])and sad, lonely subjects respectively characterize two Picasso periods named for these things. For 10 points, name this painting element described by value, saturation, and hue. ■END■