HYT stands out from the watchmaking world. Young brand, it is the result of a laboratory work. HYT watches indicates the time by the repulsion of two fluids injected into a capillary. Closer to fashion than to watchmaking, the brand wanted a catalog that detonates and reflectes its strong identity. We proposed a book with a mirror cover, naked. A neat binding, an ultra glossy paper, illustrations of fluids in dividers.