Okay. While creating this painting I have been debating about the title. At first it was Yellow/Shade, but that was not working. Then, Yellow/Umbra, and that too didn't work for me. So now the new title is Umbra. I think this works. Titles for my paintings can be an agonizing process. Usually a title or a sense of a title germinates as a painting is created.
Even though Umbra has a yellow cast to it, for me, it is full of shadows. The color yellow does not suggest shadow, quite the opposite; but for me, Umbra has an underside or interior that is cast in darkness.