Psychologists generally differentiate between telling fictional stories that feature Santa Claus and actively deceiving a child into believing that Santa Claus is real. Imaginative play, in which children know that Santa Claus is only a character in a story but pretend that he is real, just like they pretend that superheroes or other fictional characters are real, is widely believed to be valuable. However, actively deceiving a child into believing in Santa Claus's real-world existence, sometimes even to the extent of fabricating false evidence to convince them despite their growing natural doubts, does not result in imaginative play and can promote credulity in the face of strong evidence against Santa Claus's existence.