these are called music branches, designed by chris ng. they are headphone splitters which have 3 outputs (why 3? i don't know), and could potentially be combined to make a larger tree. i like modular, branch-like designs like this, like the modular candlesticks by petite friture, which i previously posted about.
headphone splitters are an odd one though. they are a product that i have seen many great designs for, but how often do most people use them? i myself own a great one (the splitterbot, below), but find very few occasions when i can actually use it. luckily i love robots, and it looks pretty good just standing there on the side anyway.
music branches via yanko design