Despite smartphones storing thousands of pictures, millions of adults still do something surprisingly old-fashioned. They keep a physical photo of their wife, husband, partner or children inside their wallet. Some photos are faded. Others have folded corners from years of use. Yet people continue carrying them everywhere. At first glance, it may seem like a simple sentimental habit. But psychology suggests something much deeper is happening. People are rarely carrying a piece of paper. They are carrying an emotional anchor. Several psychological theories help explain why this tiny habit remains so powerful in a digital world.
