Compare A and B. Entropy contrast greatly enhances subjective contours for thin line stimuli as well as rectangles.

Compare A and C. Relatability is not important in this case.

• Gillam, B. (1987). Perceptual grouping and subjective contours. In S. Petry & G. Meyer (Eds.), The Perception of Illusory Contours (pp268-273). New York: Springer