Nothing brings back memories like a photograph. But Hewlett Packard think that having the ability to stream back audio or video to a digital device by waving at a photo would enhance your nostalgia trip immensely. Hence their development of the Memory Spot, a shirt-button sized device that can store documents, pictures, audio and more, designed to be stuck onto ‘meatspace’ documents to enhance their content. It’s basically ‘RFID plus’…though hopefully not so easy to hack.