A currently touched position on a capacitive touch interface is determined based at least in part on sensing a capacitance associated with the currently touched position along a geometric shape, wherein the capacitive touch interface comprises a touchable surface at least a portion of which defines the geometric shape. The currently touched position is mapped to a corresponding value of an attribute associated with a current context. The corresponding value of the attribute is used to operate an external system associated with the current context in a manner determined at least in part by the corresponding value of the attribute. A feedback associated with the determined currently touched position and the current context is provided via the capacitive touch interface.