"The works show da Vinci's interests in painting, sculpture, engineering, botany, mapmaking, hydraulics and anatomy.They include designs for a chariot, anatomical sketches and a study of the head of Leda, who was considerd to be the mother of Helen of Troy.They form part of the Royal Collection at Windsor Castle and will be at Birmingham Museum and Art Gallery from Friday till 25 March to celebrate the Queen's Diamond Jubilee year." (Quoted from site)