What a load of balls!
We're only just starting to get into reviewing K'Nex sets, but it seems that one YouTuber has been at it for years, creating this huge and infinitely impressive ball machine. Shadowman39 spent three years assembling this epic machine, ;The Citadel', built entirely from K'Nex parts, which automatically takes a number of balls along 17 different routes.
Check out this hypnotic video, and appreciate all the damn effort that must have gone into this:
Lots of other photos can be found on his Flickr page. No, we won't be building anything like this. Because effort.