Hiranao Tsuboi Minimalist LED Watch is, Sadly, Just a Concept There's minimalism, and then there's this LED concept watch from Hiranao Tsuboi at design firm 100%. The LED lights forgo the need for a watch face by being interwoven with the links on the wristband. The look is sleek, and unlike many concept timepieces these days, I can actually tell the time. [Design Boom ]