When the earth rotates, it carries Polistra through the sun's field at varying angles.
If Polistra has a good magnetic sense, she would be feeling those lines. (Unsurprisingly, those lines look like the aurora.)
Most humans have a poorly developed magnetic sense, but some could be more talented. Birds and bacteria might be more aware of this motion.
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Graphic serendipity: Of course those lines are the aurora, but I didn't try to make them look that way. I just made some parallel cylinders and turned them partly transparent. Poser's buggy handling of multi-layered partial transparencies provided the aurora look, which is rather impressive.
The current icon shows Polistra using a Personal Equation Machine.