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 (“ROON-guh”). J. M. W. Turner referenced an iconoclastic book about these things in the title (10[1])of a painting that depicts the morning after the biblical flood. A triangle with nine segments that demonstrate these things is often named for (10[1])Goethe (10[1])(“GUR-tuh”), who used symbolic (10[1])labels like “unnecessary” in his Theory of them. (10[1])Charles Blanc’s theories about these things “mixing” in the eye inspired Paul Signac (“seen-YAHK”) and Georges Seurat to develop Pointillism. (10[2])Harlequins 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■