Melun Diptych purchased by Clemens Brentano, a German poet, and joined his collection in 1896. The halves have been reunited twice since their separation, the first time in 1904 when France borrowed the panels from Berlin for an exhibition of French primitives and the second time in 2017, for the Jean Fouquet exhibition at Gemäldegalerie in Berlin. Melun Diptych The Melun Diptych is a two-panel oil painting by the French court painter Jean Fouquet (1425–1480) created around 1452. The name of the diptych came from its original home in the Collegiate Church of Notre-Dame in Melun. The left panel depicts Etienne Chevalier
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.