An apparatus is configured with one or more sensors arranged to detect a first shape-related parameter, one or more control elements arranged to provide a force, and circuitry operably connected to the one or more sensors and the one or more control elements to determine the force provided to the one or more control elements. The light guide plate includes a light guide plate body and a plurality of microreliefs. A first step may be awakening a first processing core from a low power state in response to a first operating system thread. Therefore, only clock signals are affected by variation of process parameters. A first-tier node may be embodied as a hub controller configured to be connected to one or more of said lower-tier buses. The water content of the second electrolyte is lower than the water content of the first electrolyte.