MC Escher Modern art Concave convex Selgiochi puzzle 1000 pcs inner bag sealed

Vintage Selegiochi concave and convex puzzle by Escher; made in Holland. The puzzle is still sealed in its original bag. Contains approx. 1000 pieces Approx. dimensions: 20" x 24" Box shows plenty of wear. This puzzle depicts an ornate architectural structure with many stairs, pillars and other shapes. The relative aspects of the objects in the image are distorted in such a way that many of the structure's features can be seen as both convex shapes and concave impressions. This is a very good example of Escher's mastery in creating illusions of "impossible architecture." The windows, roads, stairs and other shapes can be perceived as opening out in seemingly impossible ways and positions. Even the image on the flag is of reversible cubes. One can view these features as concave by viewing the image upside-down. All additional elements and decoration on the left are consistent with a viewpoint from above, while those on the right with a viewpoint from below: hiding half th