When design controls things in the physical universe, it is good practice for the designer to make design choices that reflect how the physical universe is arranged (that is, “map” to a property of the physical universe). For example, at a museum, placards that describe paintings are often arranged in the same formation as the paintings themselves (spatial mapping).

Another example would be the spatial orientation of elevator buttons (to indicate ascent or descent) or the size of toilet buttons (to indicate #1 or #2).

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