Articles, particularly fibers, whose shape is dependent on temperature. A signal axis rotation circuit performs coordination transformation on the chrominance signals in accordance with a hue calibration parameter; and a multiplier multiplies the coordinate-transformed chrominance signals with a chroma calibration parameter to obtain output chrominance signals. The layer includes a group III-nitride semiconductor compound and at least one barrier to hinder current flow in the layer. The main body includes a second terminal positioned on a surface that comes into contact with the lower end portion of the lid at the time of fastening the lid. Preferably, the connectors are electrical connectors with two coupling orientations.