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The Similarity law
This law states that viewers will group elements that share consistent visual characteristics, such as a similarity in terms of colors and shapes:
The law of similarity is based on the idea that if elements are similar to or the same as each other, we will perceptually group those objects or elements together.
“Consistent sequences of actions should be required in similar situations; identical terminology should be used in prompts, menus, and help screens; and consistent color, layout, capitalization, fonts, and so on, should be employed throughout.”
— Ben Shneiderman
We will do what we did for the Proximity law for the law of Similarity. Let's design a user interface that has the law of Similarity in mind and one that ignores it.
We will have a similar result, such as this:
Alternatively, if we ignore the law of Similarity, our design will be as follows:
