Christ and the Virgin Diptych Christ and the Virgin Diptych The Christ and the Virgin Diptych consisted of two small oil on oak panel paintings by the Early Netherlandish painter Dirk Bouts (also called Dieric Bouts) completed c. 1470–75. Originally they formed the wings of a hinged devotional diptych. The original autograph diptych is lost, although numerous versions of generally rather poor quality survive including a near identical diptych in the Louvre and a similar diptych in Toronto. Other versions of each panel survive. The best versions of the "Mater Dolorosa" are in the Art Institute of Chicago and in the Weissberger collection at Madrid.
Hinged dissection Hinged dissection 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. The concept of hinged dissections was popularised by the author of mathematical puzzles, Henry Dudeney.