Crucifixion and Last Judgement diptych paintings, which included another important van Eyck work, the 1434–1436 "Annunciation". They were purchased by Charles Henschel of New York art dealer M. Knoedler & Company for $185,000, significantly less than the asking price of $600,000 when the works were offered in 1931. The panels were shipped from Saint Petersburg to the Matthiesen Gallery in Berlin before M. Knoedler & Company sold them on to the Metropolitan in New York that year. Crucifixion and Last Judgement diptych The Crucifixion and Last Judgement diptych (or Diptych with Calvary and Last Judgement) consists of two small painted panels attributed to the Early
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.