Sixth Knot, Leonardo da Vinci, c. 1490/1500

Date: c. 1490/1500. Dimensions: image overall approx: 24.77 × 24.45 cm (9 3/4 × 9 5/8 in.). Medium: engraving on laid paper. Collection: National Gallery of Art. After Leonardo da Vinci, Sixth Knot, c. 1490-1500, NGA 46383