The Spear of Selene is a mural painting from the 2017 Continuum.
A large painting which shows what may or may not be the goddess Selene holding up a spear pointed at the Moon, this artwork adorns the ceiling of a shrine room in Scrooge's Money Bin, a mournful, metaphorical evocation of Della's (supposed) death aboard the Spear of Selene.
Behind the scenes Edit
The spear pointing at the Moon appears to foreshadow the twist that Della and the Spear were not simply "lost to the inky abyss of space" but crash-landed on the surface of the Moon. This can only be coincidental in-universe, however, as this fact was not known to Scrooge when he ordered the painting.