Lego arm moves slowly, rocks mightily (video)
If you've made a Lego skull you're ultimately going to need some appendages to go with it, and Polish Lego-mistrz Paul (who goes by the handle Sariel) is the man behind this fully-articulated right arm. It uses a combination of electric motors and pneumatic valves that enable it to move... slowly. In a video embedded below that's overflowing with Marilyn Manson angst (turn down those speakers, office-bound readers) you can see it shambling from side to side and rotating at the wrist as the pneumatic fingers are actuated. The range of movement is impressive, but this thing looks about as easy to operate as a dockside crane and seems slightly less precise. Still, it's an impressive feat of plastic engineering; that it was whipped up over a weekend makes it even more so.

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Lego arm moves slowly, rocks mightily (video)