Nowadays, producing and saving images is so easy that few people bother with paper prints, photo albums, or even cameras. They hold up their phone and click away, hoping to end up with something decent, which they then post on Facebook or Instagram or whatever. But a digital camera roll containing thousands of unsorted, unedited, contextless images is not an intelligible narrative of a life. Turning the pages of a physical book is a different experience from swiping a finger across a screen, and, if you don’t store your memories on paper, you allow your past to be held hostage by a potentially obsolete digital format or by Google’s unpredictable commitment to the cloud.