The perceived shape of an amodally completed figure depends on orientation. Different observers were shown the same configuration in these two orientations and asked to complete the partially occluded figure as a regular hexagon. Then, they were required to decide if a briefly flashed probe was within or outside the contour of the completed hexagon. The results indicate that the perceived position of the probe was affected by orientation in the expected direction.
Bilateral symmetry dominates only when the axis is vertical.