Excellent stuff, as others have mentioned, I thought of Tufte meets Web. The "Tools & Implementation" section had me thinking of the pure data sound programmin

Excellent stuff, as others have mentioned, I thought of Tufte meets Web. The "Tools & Implementation" section had me thinking of the pure data sound programming environment - the way you drag the numerical parameters in the code (cheekily reminiscent of processing) that draws the circles to change values. tangle.js is referenced in the html of the page, and I shall certainly be looking into that for maths visualisations at a more humble level.