Edward H. Adelson. Middle-grey diamonds are placed on light and dark grey strips. Ellipses are placed over the border between the strips. Opaque ellipses reduce the SC effect.
Transparent ellipses increase it.
The effect may be modulated over more than a five-fold range. The influence decays as a function of distance. At the same time, the mechanisms may be simpler than those required for full transparency analysis. The remote modulations of brightness illusions may offer a tool for studying mid-level vision mechanism.