A rectangle divided into parts is perceived differently.
For example, with two horizontal stripes of contrasting colors, it appears wider, while with three vertical stripes, it appears longer.
Try creating an elongated rectangle on the body and divide it vertically into 2-3 segments using 2 contrasting colors. At the point of their connection, the body will visually shrink and elongate.1
It is not recommended to divide the colors horizontally, as it reduces height.
The same technique can be used for the face. The hair on the sides and the face divide the head into 3 parts. As a result, the middle part narrows.
Morikawa, Kazunori, ‘Geometric Illusions in the Human Face and Body’, in Arthur G. Shapiro, and Dejan Todorovic (eds), The Oxford Compendium of Visual Illusions (New York, 2017; online edn, Oxford Academic, 22 June 2017), https://doi.org/10.1093/acprof:oso/9780199794607.003.0026, accessed 19 July 2023. ↩
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