It is an animation of the Paddington bridge, London.
The bridge consists of 8 spans of isosceles trapezoid shape.
A revolution joint (A) connects two adjacent spans.
Besides they are connected by two green conrods which are linked together by a revolution joint (B).
Yellow cylinder and red piston connect A and B.
7 pairs of hydraulic cylinders moving at the same speed roll and straighten the bridge.
At curled up pisition the brigde looks like a sculpture of octagonal shape on one side of the bank.