A communication system for communicating on a network that includes communication devices performs communications in a connected mode or a non-connected mode. In one embodiment, a method of forming a stacked device filler comprises forming a material layer between two or more substrates of a stacked device, and causing a reaction in at least a portion of the material, wherein the reaction may comprise polymerization, and the material layer may be one or a combination of materials, such as nonconductive polymer materials, for example. When forming an image, judging section 164 compares the tab dividing number with the number of the tab sheets configuring one tab sheet bundle and judges whether or not the numbers thereof are equal. Specifically, the droplets of liquid are controllably passed through the microfluidic chamber to switch the passing of light between different optical outputs.