Take a sheet of graph paper that has been divided into grids. Color a square in the middle of the top row black. Drop down to the next row. Now invent a rule that will decide if a square should be black or white, based on the square above it and that square's neighbors -- for example, that a square should be the same color as the one above it unless that square has a black neighbor. Go across the second row filling in squares accordingly, then repeat the process, following the same rule, for the third row, the fourth row, and so on.

Today's NYT has an article on Stephen Wolfram's new book. This one is more interview-and-reaction than the book review published in the June 9 NYT.