Review of Grid Chapter 11 (10-Grid.pier)

I'm not clear if thats a general comment to myself, or text you are suggesting to include.

Now I am finding it hard to review my own work here as a diff where the lines run so wide past the edge of the text box.  So I guess you might not have read the whole of the line below starting... 
"That will work since by default" 
which describes why cascade is is fragile without #yourself? Can you check that out and see if it already addresses your concern.

btw, note this tutorial shows the "not so good ways" and then discusses how to improve it.