To show both the current and the previous slide, I believe. Here's the horizontal format, complete with fancy scrolling animations: http://cr.yp.to/talks/2015.

To show both the current and the previous slide, I believe. Here's the horizontal format, complete with fancy scrolling animations: http://cr.yp.to/talks/2015.10.05/slides-djb-20151005-4x3.pdf http://cr.yp.to/talks/2015.10.05/slides-djb-20151005-4x3.pdf