In London to mark the United Kingdom launch of Windows Vista and the 2007 Microsoft Office system, Microsoft Chairman Bill Gates joined Lynne Brindley, CEO of the British Library, to announce the “digital reunification” of Leonardo da Vinci’s Notebooks, famous for images such as the Vitruvian Man. The two pieces, known as the Codices, are owned, respectively, by the British Library (Codex Arundel) and Gates (Codex Leicester). A technology called "Turning the Pages," which is based on Windows Vista, made it possible to bring the two parts of da Vinci’s notebook together for the first time since the artist’s death in 1519.