The complete world of colors in watercolor, made 200 years ago. Artist Philipp Otto Runge mapped white, black, and the primary colors as poles on a sphere. The circle at the bottom left is a slice through the equator of this imaginary color planet. • These color spheres inspired the logo for our blog, The Iris, which re-launched yesterday with a new design, and the text of over 1,000 posts available for reuse via a Creative Commons license. Link in bio!