St John Altarpiece Reed believes the similarities so pronounced that it is highly probable that the two were intended to hang together at the Miraflores monastery. St John Altarpiece The St John Altarpiece (German - "Johannesaltar", "Johannestafel" or "Johannesretabel") is a c. 1455 oil-on-oak wood panel altarpiece by the Early Netherlandish painter Rogier van der Weyden, now in the Gemäldegalerie, Berlin. The triptych is linked to the artist's earlier "Miraflores Altarpiece" in its symbolic motifs, format and intention. The panels show – from left to right – the birth of Saint John, the baptism of Christ by John in Jordan, and the beheading
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.