The author has made the presentation materials available at:

• https://homepages.cwi.nl/~steven/Talks/2018/07-31-balisage/ (slideshow)
• https://www.youtube.com/watch?v=jl4fnY4BjEY (video)
• https://www.cwi.nl/~steven/Talks/2018/07-31-balisage/transcript.txt (transcript)