Telescope, England, Great Britain, 1680 - 1700 (made), Ivory with brass and silver pique work. An understanding of astronomy and the natural sciences was a key part of a gentleman's education, but this telescope was in reality an expensive toy. Ivory was a rare and costly material. The decoration, with inset points of brass and silver, known as piqué work, was often used on fashionable snuffboxes and cutlery.
'Alam al-Din Qaysar' (13th century) Celestial globe, 1225-1226 Naples, Museo Nazionale di Capodimonte, inv. A.M. 112091 This splendid globe has silver inlay work indicating the positions of Ptolemy's 1,025 stars, graded in order of size.