Challenge #4 for Red Moon 100 is
Imaginary Friends.
An imaginary friend is a friend that is created in the minds of some people, especially young children.
Imaginary friends can serve as an important source of companionship to some children and adults, especially if companionship is absent for them in the social world. As an example, young children in boarding schools often develop imaginary friends to cope with extreme stress and separation from their intimate relations. It has also been suggested that deities, spirits, totems, demons, and similar supernatural beings are the invisible friends of adults and children alike.