Dudeney's Dissection

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One Of The Physics Fun Models...A hinged dissection, also known as a swing-hinged dissection or Dudeney dissection,is a kind of geometric dissection in which all of the pieces are connected into a chain by "hinged" points, such that the rearrangement from one figure to another can be carried out by swinging the chain continuously, without severing any of the connections.Typically, it is assumed that the pieces are allowed to overlap in the folding and unfolding process; this is sometimes called the "wobbly-hinged" model of hinged dissection