The reversible watch includes first and second cases mounted back-to-back and each having a back cover and securing elements for securing it to the other case in a way which the user can dismantle. At that time, information indicating the maximum reference index value is coded and included into the coded image signal, and the commands indicating correspondence between at least one picture number and a plurality of reference indices are generated. This prevents the ramp from bring installed correctly at any other slope or pitch. Typical utility outlets controllable by the present invention include, but are not limited to electric utility outlets, telephone utility outlets, and Internet access utility outlets. Here, the finalizable object is an object unreachable from the root set and has a finalize method. Furthermore, the compositions of the invention are particularly useful to efficiently induce self-specific immune responses within the indicated context.