This is a notable lecture on some really, really big architecture. Aside from the intriguing content, I love how Penrose uses a classic overhead projector with transparencies and drawings. They have a kind of flexibility that PPT doesn't and are less likely to be problematic technically. The double screen is also a very useful redundancy - if one unit fails (which is pretty much limited to a bulb burning out) you've still got another eye.
His visual elements are valuable and worth paying attention to as a means of communicating complex ideas. The introducer suggests that Penrose isn't that happy about an idea until it can be rendered in a drawing of some kind. That's not a bad way of thinking about things.
Now, is anyone building a highly compact, portable overhead projector?
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