A unifying theme is a common element that ties together different elements of a work of art, such as a book, movie, or painting. In crosswords, the term 'MOTIF' is often used to describe a unifying theme. A MOTIF is a recurring element in a work of art that helps to create a sense of unity and cohesion. It can be a symbol, phrase, or image that appears throughout the work. By recognizing and understanding the motifs in a work of art, viewers can gain insight into the artist's message and the overall meaning of the work.