Keywords: Christiaan Huygens-painting.jpeg <co Artwork creator Caspar Netscher Christiaan Huygens the astronomer 1671 painting cm object history credit line accession number http //ressources2 techno free fr/informatique/sites/inventions/inventions html PD because of age PD-old-100 Christiaan Huygens in art Caspar Netscher |