Match 4
- Painting A: Title and L-number: The Geographer (L27)
- Painting A: Collection: Städelsches Kunstinstitut und Städtische Galerie, Frankfurt am Main
- Painting A: Date Range: 1668-1669
- Painting B: Title and L-number: The Astronomer (L28)
- Painting B: Collection: Musée du Louvre, Paris
- Painting B: Date Range: 1668
- Alignment Orientation: Vertical to Vertical, L27 on top, L28 rotated 180◦
- Discovery Date: 2015
- Publication: [Johnson and Sethares, 2017a]
Match 4
Top: The Geographer (L27) (1668-1669)
Bottom: The Astronomer (L28) (1668)