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

Date: c. 1490/1500. Dimensions: image overall approx: 25.72 × 24.13 cm (10 1/8 × 9 1/2 in.). Medium: engraving on laid paper. Collection: National Gallery of Art. After Leonardo da Vinci, Fourth Knot, c. 1490-1500, NGA 46382