Schertz and colleagues studied how seeing different sorts of lines influences human thoughts. They “experimentally manipulated exposure to specific visual features. . . . Results . . . showed a potential causal effect of . . . non-straight edges on thinking about topics related to “Spiritual & Life Journey”, with . . . non-straight edges having a positive relationship. . . . These results have implications for the design of the built environment to influence human reflection and well-being.” So, people were more likely to think about spirituality and life journey when looking at images with a larger number of nonstraight lines than they were when viewing with ones with more straight lines.
Kathryn Schertz, Sonya Sachdeva, Omid Kardan, Hiroki Kotabe, Kathleen Wolf, and Marc Berman. 2018. “A Thought in the Park: The Influence of Naturalness and Low-Level Visual Features on Expressed Thoughts.” Cognition, vol. 174, pp. 82-93, https://doi.org/10.1016/j.cognition.2018.01.011