Proteus Proteus is an island/rambling-in-the-wilderness simulation.
Or perhaps a musical instrument in the shape of a virtual island.
You arrive at the island.
(It's a different one every time, though the elements remain the same.)
You walk around.
The weather changes.
The sun sinks. The moon and stars come up.
You follow a frog. Or an owl.
You listen to singing mushroom critters.
The seasons change.
Everything has a tune. Walking creates a symphony.
Nothing else happens.
You can take photographs.