Moonlight grey, as pale as a nymph who became a constellation.
Callisto is a light grey.
It can be described as light, pale and neutral.
Set in black, because black reads best on it.
In Greek mythology, Callisto was a nymph, or the daughter of King Lycaon; the myth varies in such details. She was believed to be one of the followers of Artemis who was pursued by Zeus. Many versions of Callisto's story survive. According to some writers, Zeus transformed himself into the figure of Artemis to pursue Callisto, and she slept with him believing Zeus to be Artemis.
Read on WikipediaCallisto is the second-largest moon of Jupiter, after Ganymede. It is also the third-largest moon in the Solar System, following Ganymede and Saturn's moon Titan, and nearly as large as the planet Mercury, but only about a third of that planet's mass. With a diameter of 4,821 km, Callisto is roughly a third larger than Earth's Moon and orbits Jupiter on average at a distance of 1.883 million km, which is about five times further out than the Moon orbiting Earth. It is the outermost of the four large Galilean moons of Jupiter, which were discovered in 1610 with one of the first telescopes, and is today visible from Earth with common binoculars.
Read on WikipediaCallisto is a superhero appearing in American comic books published by Marvel Comics. Created by writer Chris Claremont and artist Paul Smith, the character first appeared in The Uncanny X-Men #169. She belongs to a subspecies of humans known as mutants, who are born with superhuman abilities. She is also known under the codename White Knight.
Read on WikipediaProper noun