Very cool (well, actually insanely hot) nebula. The Wolf-Rayet star that illuminates it emitted the material when it went red-giant, 250-400K years ago according to Wikipedia. The intense radiation from the WR star flogging the outward-moving gas both ionizes it and creates shockwaves, one moving in, one moving out. It's actually a fairly bright X-ray target too, so plenty the hot there!

This is a lark, playing with one channel from one night's data. One hour of H-alpha with stars removed. The orientation is just how the scope happened to be set up; the eccentric cropping gives a feeling of movement.