It's not nearly as pretty a book as the Architecture Pack. It has some clever mechanisms to illustrate mathematical concepts, but the book design itself is ugly, all clashing saturated colors and minimalist forms. The mechanism for making a crosshairs for Cartesian coordinates, and the one for plotting two intersecting lines so that the intersection point is white when neither is present, blue or red when one line is present, but purple when both lines are present, are interesting. It's too bad the author didn't know about the mathematical monkey-- it would have made a good addition to the book.