Frederick - yes, I agree that we should have top-level discussions of the types you mention! I'd _love_ to see some of the sort
* Exercise #
* Puzzle # - Chapter #
So, please start them! It would be nice if the first post in such discussions merely stated the exercise and/or puzzle. Then the next post could be your solution (or someone's solution), and then other solutions and discussion thereof. If I get ahold of the LaTeX for _Seven Sketches_, this may reduce the amount of typing required.
There is already a partial list of responses to puzzle 4 here:
* [Responses to Puzzle 4](https://forum.azimuthproject.org/discussion/1822/puzzle-4-responses)
Over there, [Daniel Cellucci and I are started to discuss using the Azimuth Wiki to store information like answers to puzzles](https://forum.azimuthproject.org/discussion/comment/16242/#Comment_16242).