Impossible cube ambiguity present in a Necker cube illustration, in which a cube is drawn with its edges as line segments, and can be interpreted as being in either of two different three-dimensional orientations. An impossible cube is usually rendered as a Necker cube in which the line segments representing the edges have been replaced by what are apparently solid beams. In Escher's print, the top four joints of the cube, and the upper of the two crossings between its beams, match one of the two interpretations of the Necker cube, while the bottom four joints and the bottom crossing match the
Root Creek, Wisconsin Root Creek, Wisconsin Root Creek was a hamlet in Sections 21-22 and 27-28 of the Town of Greenfield in Milwaukee County, Wisconsin, on the Milwaukee-Janesville plank road, at what is now roughly the intersection of that thoroughfare (now Forest Home Avenue) and 68th Street. The body of water after which it was named is nowadays referred to as the Root River. The post office there was established August 19, 1847, near the eastern bank of Root Creek. When Peter Lavies became postmaster in 1854, soon after the establishment of the Hales Corners post office just on the other side of