Items relating to each other should be grouped close together. When several items are in close proximity to each other, they become one visual unit rather than several separate units. This helps organize information, reduces clutter, and gives the reader a clear structure.
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WILLIAMS, Robin, 2004. The non-designers design book: design and typographic principles for the visual novice. 2nd ed. Berkeley, Calif: Peachpit Press. ISBN 978-0-321-19385-8. pdf 
Punkt und Linie zu Fläche (Point and line to surface/area/face)