Oh I don't doubt that humans can distinguish between more than 16 colors. But white/blackboards are used mostly for sciences and business, not drawing. Trying

Oh I don't doubt that humans can distinguish between more than 16 colors. But white/blackboards are used mostly for sciences and business, not drawing. Trying to distinguish between turquoise and aqua in a graph or formula is difficult at best. (And I really wish infographic/map designers understood this concept.)