It can take a while to wrap your head around an Urwerk movement and for the firm's co-founders, Felix Baumgartner and Martin Frei, that is the point. They deepen the relationship between wearer and watch and create innovative movements and complications that require you to think and, in some pieces, choose how you interact with the piece. The Swiss brand's artisans test the boundaries of horology at workshops in Geneva and Zurich but its timepieces find their way to wearers in all corners of the earth.Though its Historical collection may suggest an adherence to tradition, the timepieces of this line are futuristically complex in both appearance and movement. A world first, the Opus 5 model displays a service indicator on its back and the C3H5N309 (the chemical formula for Nitroglycerine) presents polygons that rotate eccentrically rather than centrally. The Satellite, Chronometry and Special Projects collections astound with equal aesthetic and technical complexity, upholding the innovation that permeates the brand.