The OneSense headphones are a concept design by Joe Doucet. The purpose of them is to both provide an immersive experience, and also to discourage distraction that could interrupt your listening pleasure.
The headphones themeselves block out visual stimulation, and also go a little ways to block out other sounds as well, presumably with some sort of noise cancellation technology.
At first, I thought that the spikes were some sort of anechoic coating to absorb sound, but they are actually meant to be some sort of psychological warning, meant to tell people “back off, I’m a freak, and I’m listening to music!” so the wearer can relax without being bothered.
The OneSense headphones were on display at the Meet My Project design show held in Milan.