Purposeful items, and just, well I hate to say it like this, but environmental storytelling.
Think like family pictures. Or a bookshelf that is not neat or orderly which means that whoever here likes to read and does not really care about how the display looks, but instead the books were often taken off the shelf, and then put back on wherever they fit. A desk that is filled with paper items, but also has just enough space for writing or daily work activity. An unfolded throw on the sofa, and the remote TV next to it on the coffee table. An unmade bed because someone was in a rush that morning. A slightly dusty shelf where nothing is placed, compared to some that are cleaner, where they have things that are often used.