Freo Nebula
A planetary nebla with a brigght star at the center of a dark cavity. This cavity is surrounded by a rim of dense, luminous gas.
The cavity and rim are trapped inside a barrel of the star's former outer layers. At either end of this barrel, there are handles, joined to the tips of the cavity inside by long jets of low-density gas.
From Earth, this same phenomenon can be observed in NGC 7009 (the Saturn Nebula.)