Timeless entertainment

How long has juggling been a form of entertainment? A long time, according to Wikipedia. It is a great demonstration of dexterity, which can also be artistic, as the first link shows. It struck me as I watched that video that a gleeman from a thousand years ago would have recognized this act, even if he was quite confused by the clothes and the style of music (A Knight's Tale not withstanding). And many standard juggling acts would be the same as the gleeman's. How many forms of entertainment can make that claim, and still please audiences?