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Plenty of Camouflage in New York Harbor in New York Times (January 20, 1918), p. 63—
The wonders of camouflage, as it is practiced by the men of the fighting armies abroad, are much pictured and described for American readers, but any New Yorker who wants to inspect its experiments for himself has only to take a ferry boat trip across the harbor on almost any bright day. There he will see at anchor, or coming in or going out, numerous ships whose painted sides reveal such wild extravagances of form and color as make the landsman open his eyes with amazement and mystification.
Answers: (top to bottom) Caravaggio, Juan Gris, Pablo Picasso and Wassily Kandinsky.