Proteus is an indie video game that came out in 2013, focused on exploration with an emphasis on “nonviolence”. The soundtrack is written to reflect the natural beauty within the game, which is deterministic. However, the music that reaches the player’s ears is non-deterministic because it is influenced by the player’s environment and their interactions with the environment. For example, when the player is in a dense environment, the sound is very dense. When the player is walking, the sounds behave as they do when you yourself are walking.
The video game, as stated above, is intended to reflect a nonviolent existence. The soothing music plays into the message, and the exploratory theme is emphasized by the player’s active role in how the music sounds. I think that this is a very basic but incredibly powerful method of getting the designer’s message across.