An exemplary display of the latter is The Citadel. Over the course of three years, redditor [Shadowman39] pieced together this monstrous K’nex structure. With over 17 different paths(!), ...

But better late than never, we always say, so behold, (a little at a time, because there’s quite a lot to look at), [Tyler Bower]’s pinball machine built entirely from K’nex. Where do we ...