The palette
Water takes more of this sheet than land, on every side, so its ink is the frame of the poster: whatever you choose surrounds the town completely. A deep ink makes the island read as an island at once; a pale one turns it into a drawing of streets on a soft ground. Green is scarce and comes in small patches, the triangle at the western tip the largest of them. The grid is fine, and a mid-tone line keeps it crisp against the water.