A timepiece (40) includes optical means for forming a decorative pattern, in the form of a figurative image, in response to user action. The optical means forming a figurative image include an optical guide (1, 51) having two large faces (10, 11) and at least one lateral face (12). Optical extractors...http://www.google.com/patents/US7839726?utm_source=gb-gplus-sharePatent US7839726 - Timepiece including optical guide which performs the function of a crystal
