I frequently read more than one book at a time. And I always have pages marked in other books for reference later. My bookmarks are scraps of paper, a very old church bulletin, a business card from a favorite hotel in Provence. a pretty metal 'hook' mark with a buffalo charm from Travis and Becky, a paper bookmark from a online book seller, and a pretty calla lily bookmark that slips over a page and anchors itself with a tiny magnet...a gift from Laury. One way I NEVER use to bookmark....a folded-over corner. We called that a 'dog ear' in the States. I must have been yelled at by an irate librarian in my childhood for doing this. Dog-earring a book feels like a mortal sin to me!