What are the black squares in the library catalogue?

Have you seen black squares like this within e-Knowledge (the library catalogue) and wondered what they were? Well, they are QRcodes.

QRcodes are handy barcodes you can scan with a smartphone. We've started to use them experimentally in the library catalogue. We hope they'll save your fingers inputting lengthy URLs when you want to bring up a book-location map or ARAN repository PDF in your smartphone. Bring the map with you as you locate the book! Read the PDF on the bus.

While they are used extensively in Japan for advertising purposes, we think this is their first application in a library catalogue. Enjoy!