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 (10[1])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[2])(“GUR-tuh”), who used symbolic labels like “unnecessary” in his Theory of them. Charles Blanc’s theories about these things “mixing” in the eye inspired Paul Signac (“seen-YAHK”) and Georges Seurat to develop Pointillism. 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■