This year may go down in history as the year of the 'selfie', with even world leaders getting in on the act, but we're asking for something a little different.

We want your shelfie. What's more telling than a bookshelf? You can share a snap of a single shelf or your entire bookcase - you decide. If you're feeling in a particularly adventurous mood, you could even film yourself giving a guided tour of your shelf, explaining your categorising methods; do you, for example, only place novels together if you think the characters in them would get along?

You can send us your photo by clicking on the blue 'contribute' button on this page or download the free GuardianWitness smartphone app and upload your shelfie from your phone. You can look at the contributions on GuardianWitness and we'll feature a selection of our favourite images.