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 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 (“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 (10[1])Signac (“seen-YAHK”) and Georges (10[1])Seurat to develop (10[2])Pointillism. (10[1])Harlequins and sad, (10[1])lonely subjects respectively characterize two Picasso periods named for these things. (10[2])For 10 points, name this painting element described by value, saturation, and hue. ■END■