Entertaiment can be as simple as a crossword puzzle, or as complex as a theater production. It can be a private affair for two, or an enormous celebration with music and food. It can involve activities that were once used in war or hunting, now performed for spectators, such as archery or fencing. It can also encompass activities that were once considered work or even cruel, such as public executions. Such themes, images and structures often transcend media, inspiring retellings in multiple forms. The famous story of Scheherazade, for example, has been adapted by composers like Rimsky-Korsakov and Ravel; directors like Pasolini; and innovative video games.
Entertaiment hits on themes that the brain was evolved to react deeply to, in order to function in a social world. It stimulates the brain to realease seratonin, dopamine and other feel good chemicals.