From: The World In Your Head by Steven Lehar

Fig. 11.6 The fields of visual balance due to a square can be explored by moving a circular test dot around within that square, as suggested by Arnheim (1969a). In the progression from (A) through (D), the dot appears increasingly unbalanced relative to the square. The pattern depicted in (E) (adapted from Arnheim) suggests the fieldlike influence generated by the square, where regions of denser dashed lines represent regions of greater visual balance. This field appears to define a central skeleton composed of axes of symmetry.