However, the most intriguing part for me is the following interactive ternary plot:
I'm a fan of of expanding readers's visual vocabulary by exposing them to novel and unusual graphic forms. That said, if we know that many people still struggle with two-variable scatter plots, I wonder how they'd react to the graphic above, and also whether textual clarifications may help in cases like this, or if they'd be too redundant.
UPDATE: Plotly's Nicolas Kruchten has shared this article about how ternary plots work.