Frith has been making kinetics for 20 years. She produces both mobiles and stabiles in a large variety of sizes, shapes and colors. (You can choose the colors of your piece with an online "colorizer" tool). The finishes are rust-proof, which makes these pieces work inside or out.
Mobiles are a fun way to enliven the airspace in the typically high-ceilinged SF home, and Frith's work fits this bill beautifully. They are lightweight and engineered to pivot or rock at the slightest provocation. Once the eye is drawn up to check one out it will usually be entertained for some time by the languorous movement, at least on an open-widow day.
Firth's standard models are priced from $100 to $2000, depending on size and complexity, and will arrive at your door one to two weeks after you place your order online.
She loves to do custom work; just send her the approximate size of the space you have in mind and the height of the room, and/or a picture, and she will create a mobile to fit.