Acoustruments: passive, acoustically-driven, interactive controls for handheld devices

@article{Laput2015AcoustrumentsPA,
  title={Acoustruments: passive, acoustically-driven, interactive controls for handheld devices},
  author={Gierad Laput and Eric Brockmeyer and Moshe Mahler and Scott E. Hudson and Chris Harrison},
  journal={ACM SIGGRAPH 2015 Emerging Technologies},
  year={2015}
}
Smartphones and handheld devices are increasingly being used in interactive applications beyond their conventional touchscreens. For example, tangibles allow users to interact with mobile devices using physical objects both on screen and around the device. Similarly, there is a growing class of auxiliary devices that require a smartphone to be docked, transforming an otherwise simple object into something with rich interactivity. However, these auxiliary devices still require numerous… 

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References

Acoustruments: Passive, Acoustically-Driven, Interactive Controls for Handheld Devices
TLDR
This work introduces Acoustruments: low-cost, passive, and power-less mechanisms, made from plastic, that can bring rich, tangible functionality to handheld devices, introducing a cheap and passive method for adding interactive controls to consumer products.