[PhantomGremlin]

It's a short video. Everyone should watch it. Not necessarily for the walker, which is somewhat primitive, though probably state-of-the-art for its time. Watch the video for the accompanying commentary.

Ivan has such a simple, elegant way of explaining things. In just a few sentences he clearly explained all the key elements of the walker.

That's a wonderful pedagogical talent. Another person with such a talent was Richard Feynman.