Universal Principles of Design, Revised and Updated
by William Lidwell, Kritina Holden, Jill Butler
Similarity
Elements that are similar are perceived to be more related than elements that are dissimilar.
The principle of similarity is one of several principles referred to as Gestalt principles of perception. It asserts that similar elements are perceived as a single group or chunk, and are interpreted as being more related than dissimilar elements. For example, a simple matrix comprising alternating rows of dots and squares will be interpreted as a set of rows only, because the similar elements group together to form horizontal lines. A complex visual display is interpreted as having different areas and types of information depending on the similarity of color, size, and shape of its elements; similar elements are interpreted as being relevant ...
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