With jellyfish, it’s hard to know where to start. Or where, indeed, they end. (See: the Portuguese man o’war, which is not actually one jellyfish but a siphonophore, or, colonial organism, of different zooids working in symbiosis.)
While the octopus gets a good rap (see, for example: Peter Godfrey-Smith, Other Minds: The Octopus and the Evolution of Intelligent Life) because it is clever,
amazingly well-developed, thoughtful, etc etc, jellyfish have a less rarefied reputation. They just drift about mob-handed, stinging people.
But I like them. The photographer Brassai finds them on the walls of Paris.
Biologist Ernst Haeckel, while unfortunately an inaccurate proto-Nazi, did create the most stunning jellyfish illustrations, published in 1904 in Kunstformen der Natur (Art Forms in Nature).
and the charybdea:
Lastly, I like jellyfish because they would seem to inhabit or at least inspire the classic video arcade game of Pac-man, 1980.