Even aside from the specifics of ClojureScript, this is just a wonderful example of separating and planning for the requirements of an application. How is a pi

Even aside from the specifics of ClojureScript, this is just a wonderful example of separating and planning for the requirements of an application. How is a piece defined and drawn? What control does the user have over a piece? Since two pieces cannot intersect, how can I detect that? And so on... Not unique to ClojureScript, it's a great reminder the best way to write great code is to ask these questions and answer them before you begin composition. Anyway, great work!