I just finished this 26"x32" (roughly) oil painting on a wood panel. It was a commission so I'll have to let it go as soon as it dries.
The client wanted a painting of something that represented change and transformation or a journey. I started thinking online i.e. Wikipedia.com and somehow got into the phases of planets.
The twilight zone came up, also known as the terminator line, which is the boundary between the illuminated and unilluminated hemispheres of a planet...basically sunrise and sunset. It was interesting to read that the sun may rise or set, in flat land conditions, at a speed of 1,000 mph (faster at high altitude because if there's a mountain in the way the horizon line is a lot higher) and as slow as 0 mph at the poles creating full days of sunlight or darkness. Pretty sweet.
I wanted this painting to ambiguously represent both sunrise and sunset.