I was thinking of a situation in which a life form evolves a biological screen somewhere on its body that can play videos. The life form would play videos on its biological video screen in order to share ideas and memories with other members of its species. The videos that the life form could play could be simulations of what has happened or could happen in the real world or they could be simulations of entirely fictional worlds.
How would a biological video screen work? What kind of selective pressure could cause a species to evolve to have a biological video screen?