In the great gadget filing cabinet of this world, there are only two places you could file the Vessyl. Either in the “When I didn’t know this existed I didn’t care, but now I do I really really want it” section, or the one headed “Why would anyone think I want this?” It’s a cup that can analyze what you are ingesting when you drink whatever it is you’re drinking and it’s got an app that allows you to input your fluid intake using a mobile device. Let’s look at its exernal attributes first. The Vessyl is gorgeous. It’s designed by Yves Behar, one of the best product designers around today. Like a cashmere sweater, it’s hand-wash only. No instruction manual is needed, the display is activated merely by tilting the cup.