I've also come away from my book jar for the moment. I've been having a children's and YA fest, reading through the Waterstone's prize shortlists, but I know that jar is there waiting for me when I'm ready. As Janet and Kay said, don't worry about it, and if you've got books you want to read now, just go with the flow. You'll know when it's time to use it … perhaps next time you're dithering about which book to read, the box can help you then.