An ink cartridge used in a color printer, comprises at the surface, a convexity or convexities that correspond to a color of an ink, and that can be identified by tactile sense. The new variety is believed to be a spontaneous mutation of the Shamrock variety of unknown causation. A modulation unit executes a modulation process on the encoded Lch data so as to generate an Lch data symbol. The signal processing subsystem then transmits the stimulation control signal to at least one stimulator, which provides stimulation to a wearer of the device reflecting the stimulation control signal received from the signal processing subsystem.