In a display region of an active matrix substrate, an interlayer insulating film made of a photosensitive organic insulating film, an insulating film different from the interlayer insulating film, and a plurality of pixel electrodes formed on a surface of the interlayer insulating film are provided. The swivel caster may be a dual wheel swivel caster. In one aspect a particular color is gray, actual ink black, and other-color inks magenta, yellow and cyan. The workspace may include a menu of structural elements that may be added to the course. In that embodiment, the liner is provided with catch lips to hold the liner in the shell and a positioning flange which operates to form a relief gap between the shell and the liner.