More photos of QR-codes found on everyday items in Japan. Starting with 2 magazine adverts for mobile phones featuring barcodes linking to the mobile site of the maker; a graphics-softwares tutorial book that has a barcode on its cover including all the details about the book so you can come back later and ask for it precisely for example; a mini-guide to Tokyo areas and streets featuring a different barcode on each spread that if scanned takes you to a mobile site page giving you more precise information on Gourmet or Lodging informations for that very area delimited by the spread's contour; and finally an ink-stamp made by Sachihata with a barcode that could include all your contact details to then be printable on some of your belongings, letters, business cards.
QR Code is a kind of 2-D (two-dimensional) symbology developed by Denso Wave (a division of Denso Corporation at the time) and released in 1994 with the primary aim of being "a symbol that is easily interpreted by scanner equipment".
Multiple bar code layout
2D Code with stacked bar codes (stacked bar code type)
2D Code (matrix type)