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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.