Prism is a Calico tom who's mate (Shina) cheated on him while she was carrying his kittens! So sad!
One of those kittens is Prisma, who is almost exactly like her father.
This is a picture of Prism (Who is a ghost and doesn't know he had kittens) and Prisma (Who is being herself)
(Yes, Prisma was named after Prism)