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Magic Window is one of my all-time favorite apps, ever! It's filled with relaxing scenes accompanied by ambient sounds. Watch the sun set behind an ocean as fast or as slow as you'd like -- all while listening to the calming sound of waves; or, watch a thick, cloudy fog roll across a moonlit river valley. Those are just two of my favorite scenes, but there are tons to choose from with even more to purchase if you can't get enough.
App Store Link: Magic Window ($1.99 + optional in-app purchases)