This was a follow-up to the
webpage version of the talk, which, while more skimmable and browsable than the video, was still trapped in the tiny rectangle.
This poster uses nine video frames (iPads). The playing video moves from frame to frame as the video progresses from chapter to chapter.
Beneath the frames is a touch-sensitive strip of thumbnails. The viewer can run their finger along the strip to scrub through the video, or simply tap a thumbnail to start playing from that point.