The document discusses the use of crystal in architectural design. It shows images of crystal installations in the reception area, dividing walls, bar counter, and light fixtures of a hotel. The crystal elements include handmade glass components, glass mosaics in shades of silver, blue and black, bubbles, rainbow patterns, sandblasted reliefs, and technical glass. The designs are credited to architects René Roubíček, Marcela Vavrušková, and Simona Kastnerová. Contact information is provided for Sans Souci headquarters and international branches.