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It is possible to fill the plane with polygons which do not meet at their corners, for example using rectangles, as in a brick wall pattern: this is n
It is possible to fill the plane with polygons which do not meet at their corners, for example using rectangles, as in a brick wall pattern: this is not a proper tiling because corners lie part way along the edge of a neighbouring polygon. Similarly, in a proper honeycomb, there must be no edges or vertices lying part way along the face of a neighbouring cell. Interpreting each brick face as a hexagon having two interior angles of 180 degrees allows the pattern to be considered as a proper tiling. However, not all geometers accept such hexagons.
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Cannonballs piled on a triangular (front) and rectangular (back) base, both FCC lattices.
Cannonballs piled on a triangular (front) and rectangular (back) base, both FCC lattices.
Collections of Snowballs arranged in pyramid shape. The front pyramid is hexagonal close-packed and rear is face-centered cubic.
Collections of Snowballs arranged in pyramid shape. The front pyramid is hexagonal close-packed and rear is face-centered cubic.
Image: Hexagonal close packed unit cell
Image: Hexagonal close packed unit cell
Image: Close packed spheres, with umbrella light & camerea
Image: Close packed spheres, with umbrella light & camerea