Ken Perlin sketches his thoughts and ideas as Java programs on the Web. He marvels that Leonardo Da Vinci's Lester Codex was recently presented in New York City as "science" at the Museum of Natural History, yet as "art" at the Metropolitan Museum of Art: two cultures, divided by Central Park. He looks forward to the day when all children will grow up learning how to express their ideas procedurally, as a birthright of 21st century literacy. And show their source code. Ken lives in Manhattan, where he is on the faculty of the Courant Institute of New York University.