The Eyed Balloon

"The moon was a giant eyeball, and the lid had just opened. It looked exactly like Odilon Redon's 'The eye like a strange balloon goes to infinity' or Mizuki Shigeru's faux American yokai, 'Backbeard'."

- Joji in JORGE JOESTAR Chapter 10: The H.G. Wells

The Eyed Balloon (アイドバルーン Aido Barūn) is a living phenomenon in space from the light novel JORGE JOESTAR. It is suspected to be Mars’ third moon.

It is created by Kars, who holds it while running laps around Mars.

Appearance
The Eyed Balloon is described to be a five-kilometer long sphere. With an eyeball at the center, and appears to have large eyelashes. It is made out of stone and doesn't appear to have any craters. It is able to create tentacles, and contains 36 Giotto's probes inside of it. It is located about eight kilometers above Mars, near its atmosphere.