Where, at Yeshiva Museum, the artist Sebastian Mendes sits signing thousands of names on a large piece of paper to commemorate his grandfather, a righteous crypto-Jew who saved thousands and thousands of lives in 1940 in the South of France by signing 30,000 exit visas, while at the same time, in the same city, a young Jewish boy runs around and around in the basement gym at day care during movement class singing a happy nonsense song that sounds like "naaaatseeees.....naaatsees..."