an organic user interface (OUI) is defined as a user interface with a non-flat display In an OUI, the display surface is always the locus of interaction, and may actively or passively change shape upon analog (i.e., as close to non-quantized as possible) inputs. These inputs are provided through direct physical gestures, rather than through indirect point-and-click control. The term "Organic" in OUI was derived from organic architecture, referring to the adoption of natural form to design a better fit with human ecology. The term also alludes to the use of organic electronics for this purpose The three design principles of OUI ar Input equals output,Function equals form and Form follows flow. Input equals output means output is generated graphically on the screen on the basis of input provided by a control device such as a mouse. Function equals form means the shape of an interface determines its physical functionality. Form follows flow indicates OUIs physically adapt to the context of a user's multiple activities