A painting I did of the gliders that sail in the skies of Neptune.
When researching for my worldbuilding I learned that airships and aerostat habitats weren't really possible on a gas or ice giant like Neptune - your lifting gas needs to be lighter than the stuff around it, and Neptune's atmosphere is already composed of hydrogen and helium, our two choice lifting gases on Earth. Orbital tethers were possible, but the idea of gliders that were forever aloft in the atmosphere captivated me.