Fundamental Principles
Holman and Vertegaal present three design principles for OUIs:
Input equals output: In the GUI there is a clear division of input and output. The mouse and keyboard input actions from the user. Based on those actions, output is generated graphically on the screen. A key feature of OUI is that a piece of Organic light-emitting diode paper, or any potentially non-planar object for that matter, is meant to input actions from the user and also output them onto the same object.
Function equals form: The form of an object clearly determines its ability to be used as an input. The statement "function equals form" emphasizes this dependency on one another. Holman and Vertegaal argue that these two are in fact inseparable and that it is a mistake to try to deny this in any way.
Form follows flow: This principle states that it is of utmost necessity for OUIs to negotiate user actions based on context. e.g. the ubiquitous 'clamshell' phone, where incoming calls alter the phone's function when opening the phone during an incoming call.
Read more about this topic: Organic User Interface
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