>Oberon’s «desktop» is an infinitely large two-dimensional space on which windows (and documents, since the distinction becomes meaningless in some ways) can be arranged [...] When people held presentations using Oberon, they would arrange all slides next to each other, zoom in on the first one, and then simply slide the view one screen size to the right to go to the next slide.

It is commonly said that Plan 9 from Bell Labs is more UNIX than UNIX. This idea of sliding the view along an infinite plane, in turn, seems to me even more UNIX than anything I've seen or heard of. Not having used -- and in fact only having heard of in passing -- Oberon before, I can't comment on how Unixy the remainder of the system is, but none-the-less, this right here seems to capture the essense of UNIX. In all the times I have been impressed by well composed presentations, never have I questioned the need for "tricks" like screenshots and videos to get a coherrent presentation of interactive tasks or information from software external to whatever tool was being used to run the presentation.