This is an insightful read. I've built many charts and graphs myself in the past and rate my chart skills above a majority. However I still learned something new.
I have two highlights. Any chart is a simplification of reality, and it reveals as much as it hides. You can present any information in both positive and negative light on the chart. Which leads to the second highlight: a chart shows only what it shows and therefore, we must strive not to read too much into it.
The book is short and easy to read as it has a lot of graphs to look at. I'd recommend it to everybody as it gives basic graphical literacy or graphicacy how the author puts it.