the hadaga is the book that gives the instructions. it includes passages from the bible. it includes sections -- on ritual and songs. many times, it includes illustrations. >> i think we have a couple pictures to show folks about examples in the exhibit. what are we looking at here? >> this is a page that illustrates the four questions. and one very critical part of the tradition is dialogue. and the asking him questions, and the retelling of the story through conversation. this page shows the passing on of the story from one generation to the next. >> wonderful. i think we have one other image to show. >> this is an illustration of the four sounds -- sons and it is supposed to represent all of mankind. and all these different types. so what is really important about this page is that we have the wicked son, and it is illustrated similarly to a german aristocrat, referencing a nazi. you can see that he has a mustache that is similar to hitler. and this is one of the ways that shake was able to draw parallel to his contemporary society. >> in his contemporary time, how was