http://www.arq4design.com/tododesign/ridge-stone-kuf-a-modular-system-of-decorative-lighting-components-by-vacek-smid/
RIDGE STONE - KUF is modular system of decorative lighting components for residential and public spaces. The basic module in 500 x 500 mm dimensions can be installed on walls or ceilings as well as an decorative cladding for large surfaces or as an individual lighting.