I may have seen this before, or at least someone with a similar shtick. I can only see the still video preview though from this device.
It's always so interesting to learn about early technologies and old techniques. Stuff like this is an inspiring example of what humans can do, even though many aspire to little more than a biweekly paycheck from a system that affords them no dignity.
I might try opening this link later on with something that can actually play videos.
"Imagine mining, smelting, and forging steel tools barefoot."
For me personally that would be an extraordinarily painful experience and quite a pitiful sight to behold. I imagine it's arduous enough when one has a pair of feet to stand on.
By the way, thanks for the new vocabulary. Today I learned the word "perspicacity" from your post.
I have to use them words up before I forget them all when oldtimer's disease takes over, and I have to refer to toast as singed bread.