An interactive Web book system is provided that allows material to be contributed to the World Wide Web. The pixel sub-components are striped along a certain direction. The reflectance changing section is configured so that in a state where no pressure is applied on the panel surface, an air layer is formed between two elastic films whereas in a state where pressure is applied on the panel surface, the two elastic films contact each other. Methods and compositions for producing Group III inorganic compounds that can be used as precursors for nanostructure synthesis are provided. Before registration between the 3D scan images, the image data set is partitioned into an abdominal cavity domain, containing the organs inside the abdominal wall, and an abdominal wall domain including the abdominal wall and externally adjacent skeletal features, such as the spine and ribs. The resultant metallic colloid particles, which have higher sensitivity, are well suited as a label for immunological measurement and protein-staining agent for various proteins.