A floor lamp does more work in a room than most people credit it for. It fills the corners that ceiling lights ignore, it adds a layer of warmth that overhead fixtures simply cannot, and when it is the right lamp, it becomes part of how the room looks even when it is switched off. Crystal floor lamps are a particular commitment. Done badly they look like they belong in a hotel lobby circa 2009. Done well they bring a kind of light you cannot get anywhere else, something that scatters and moves and makes a room feel genuinely alive after dark. We have been looking carefully at what separates the ones that work from the ones that just glitter aggressively. The quality of the crystal, the proportion of the base, whether the shade diffuses the light or simply contains it. These are the lamps that earn their place in a room rather than just filling it.