[logical42]

Look, I'm going to be critical in this comment, so let me preface my remarks by saying something nice: this work seems to demonstrate that you have some coding chops. Additionally, you seem to have a good sense of aesthetic, because the data visualization does, in fact, look pretty.

However, I'm a bit put off by it. You mention Tufte, but then you have 16 step explanation of what the data visualization actually is and what it is intended to show. Your chart doesn't really convey any meaning to me when I look at it because it's unclear what the axes actually are, what the opacity is supposed to represent, and the little number on the side makes no sense unless you hover over it. You've succeed in making a chart very pretty but I feel that you may have stumbled a bit in making it comprehensible.

Just my two cents.