The term for the unit or the thing that is repeated in a pattern is a motif.
A motif can be described as a decorative image. It is usually in the form of a design, it is repeated to form patterns.
In literature, it is an idea or image that continues to reoccur. The repetition of the image helps to bring enhancements or attention to the idea that is of focus.
The idea that is regarded as a motif is one that is made to be repeated through out a book.
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