Mouse mat, reproducing an annotated scaled drawing 'Symmetry of Man' by Leonardo da Vinci (1452/3-1519). Produced by Custom Works, 1990-1999. 26x20.3cm. Also known as Proportions of Man or Vitruvian Man; diagram of a man, limbs outstretched to proportions of circle and overlapping square (The original drawing, Uomo vitruviano, c1490, 344x245mm, is in the Gallerie dell'Accademia, Venice). Souvenir accompanying but not included in artwork of 'The Art of Invention: Leonardo and Renaissance Engineers' exhibition at the Science Museum 19 October 1999- 24 April 2000