[bglazer]

Your point about the domes is quite interesting. Can you imagine what it was like to be a citizen of Rome in the year 800, looking at a dome that is hundreds of years old and having no idea how people could possibly do that. I can't think of a modern analogue.

It would be like finding the monolith from 2001 on the moon.

[bsder]

> I can't think of a modern analogue.

There are plenty.

Ironically, building a medieval cathedral is one of those analogues. Yes, we can build a cathedral with modern equipment, but we don't know how much of it was done without it. Much of the knowledge was considered too commonplace to be worth writing down.

A modern one ... how about a Saturn V rocket. We no longer have the steel mills with big enough tooling in order to actually build such a mammoth beast. We would have to reinvent much of that tooling in order to do it again.

[sanoli]

I don't think we'd have to reinvent the tooling. I'm pretty sure we haven't forgotten how to do it. We'd have to build the huge mills again, sure, but that's a different thing.