[zdw]

The most nostalgic part of this is that he's doing the presentation with a camera pointing at paper/books setup. Back in the 90's when I was talking CS, professors routinely presented by writing on plastic sheets using an overhead projector.

Not sure what I was expecting from Knuth though - maybe I was imagining some amazing TeX-based live diagramming environment, but then again he doesn't really use email which should have tempered these expectations.

[adalacelove]

I recently found these videos about number theory

https://youtube.com/playlist?list=PL8yHsr3EFj53L8sMbzIhhXSAO...

And I was surprised both by how effective the method of camera and pen and paper was and by the didactic quality of the lectures

[WillAdams]

Dr. Knuth often presents using transparencies --- that's how he did his "Earth-shaking announcement":

https://news.ycombinator.com/item?id=1257488

[leephillips]

He’s using what’s called an opaque projector—a super useful instrument.

[daveevad]

It looks to me like he's using a product by WolfVision that markets itself as a Visualizer[1].

[1](https://wolfvision.com/en/products/vz-8uhd)

[leephillips]

Ahh, I guess what I meant to say was that in olden days the optical version of this was called an opaque projector.