1. Thoughts
This content is under a Creative Commons Attribution 4.0 license. By Douglas P. Perkins.

2. Saint George and the Dragon. By Raphael, circa 1506.

3. En Norvégienne. La barque à Giverny. By Claude Monet, circa 1887.

4. Bathers in Asnières. By Georges Seurat, circa 1884, retouched 1887.

5. Starry night over the Rhône. By Vincent van Gogh, 1888.

6. A Friend in Need. By C.M. Coolidge, 1903.

7. American Gothic. By Grand DeVolson Wood, 1930.

8. By the Water. By Auguste Renoir, circa 1880.

9. Symphony in White No. III. By James McNeill Whistler, 1866.

10. The Old Musician. By Édouard Manet, 1862.

11. The Fog Warning / Halibut Fishing. By Winslow Homer, 1885.

12. La Bohémienne endormie. By Henri Rousseau, 1897.

13. The Mona Lisa (or La Joconde, La Gioconda).
By Leonardo da Vinci,