Compare it to the games children play. They play war games, play death, they long for a game full of mature love an intimacy. They make agreements about who is in charge. They construct a balance of power in the playground.
Between the artist and the spectator you’ll find a game that’s not very different. The artist starts with the idea that the spectator will see the work of art that could fill an empty space in his head and will stimulate his mind by using the means that art is given.