It’s a tall, tiered hanging light fixture where multiple layers of glass or crystal rods hang in a spiral/tapered cone shape. The ones in your photo are clear crystal tubes arranged in decreasing circles from top to bottom, giving that waterfall effect.
Crystal elements The hanging rods refract and reflect light from the bulbs inside, creating sparkle and a bright, airy look Frame The black rings at the top are usually metal, holding the crystal tiers. The black gives it a modern contrast vs. traditional gold/brass frames Light source*: Usually E14/E27 bulbs hidden at each tier. Most modern versions use LED bulbs for less heat and lower power use.
Shape Tapered spiral design, so it works well in spaces with high ceilings