Interactive-Graphics.org

@@ -20,7 +20,7 @@ The left and right sliders in the small copy of the chart at the bottom can be u
 [[https://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0001OR][Sparklines]] such as [[figures/sparkline.png]] are tiny charts that are often embedded in tables. Again, hovering the mouse over the line shows the *exact value* at that point. Maximum and minimum values over the displayed range are indicated with red dots. 
 
 * Sankey diagrams
-An array of bifurcating unidirectional flows (of bits and bytes, in our case) can be nicely visualized using the [[https://en.wikipedia.org/wiki/Sankey_diagram][Sankey diagram]]. Here is an example:
+An array of bifurcating flows (of bits and bytes, in our case) between two sets of entities can be nicely visualized using the [[https://en.wikipedia.org/wiki/Sankey_diagram][Sankey diagram]]. Here is an example:
 
 [[figures/sankey-small.png]]
 
@@ -29,3 +29,9 @@ The interactivity of this diagram is twofold:
 - Hovering the mouse over one of the lines emphasizes the particular flow and displays info about it.
 
 * Chord diagrams
+
+Similar to the Sankey diagram, the [[https://en.wikipedia.org/wiki/Chord_diagram][Chord diagram]] is used for visualizing mutual quantitative relationships, but this time within one set of entities:
+
+[[figures/chord.png]]
+
+The interactivity features are similar to the Sankey diagram. Again, a single flow or all flows belonging to an entity can be displayed and quantified by mousing over them.