Library staff have begun adding QR codes to items in the catalogue. Here's an example. If your mobile phone can scan QR codes, your phone will display the text contained in the code - in this case, the library call number. This could be handy when you want to find a book on the shelves here - just scan the code and the call number will display - it will save you writing a long number down. Other QR codes might load a web page after scanning the code. Expect to see QR codes in all sorts of places soon. Find out more here, including how and where to download a QR reader app for your phone.