Answers will vary, but must include a definition and a sentence. Curvilinear: Lines that gradually change direction. Sentence: In his piece entitled, Tahitian Landscape, Paul Gauguin used diagonal and curvilinear lines to move our vision through the piece and helps reinforce the calmness of the mood. Form: The organization, placement or relationship of the basic elements in art, so as to produce a coherent, aesthetically pleasing image. Form gives height, width, and overall depth to artwork. Sentence: Also known as composition, the form of a work of art is significant to the other visual elements.