This paper origami V12 engine actually runs! You can buy plans from the creator here.
Built by a self-employed Montreal man named Yee, the Origami V-12 is a paper engine that pumps just like real engines (with the help of electrical wires, a resistor, a motor and a battery holder). It looks complicated because it is: One V-12 engine consists of 195 sheets of fine-printed patterns. From those sets, 1,978 pieces are used in total. And it only weighs 3.2 lbs when finished. This makes your 1,000-piece puzzle look like a piece of cake.