A three-dimensional selectively actuating interface system includes mating complementary raised and recessed surfaces, which may be projected in the shape of an indicium, such as a trade logo or trade mark, to limit the number of spatial relationships at which two sub-parts of an assembly may be assembled. Additional complementary opposing surface irregularities disposed on the raised and recessed surfaces provide a further mechanical restriction in a height direction on the number of possible spatial relationships at which the two sub-parts may be matably assembled. Combined, there is only a single spatial orientation at which the two sub-parts may be assembled. In addition, an electronic switching or detection system may be implemented, which is activated by the proper mating of the two sub-parts. The detection system acts an electronic switch for turning on (or off) another system coupled to the assembly.