On Monday, we had a Zentangle class on Zentangle-inspired art, using the Japanese technique of Notan. Notan is a study of light and dark contrasts, as well as negative and positive space in a composition. A bit of history: It was used in Japanese art, and brought to Western art schools after 1854. It became popular when Arthur Wesley Dow included it in his book on art instruction in 1899. Notan reflects the idea that the elements of light and dark are equally important and need each other to exist.