Elaborating:
The shadow looks “pretty dark” to me. When I ask myself whether it is darker or lighter than the difference between light and dark squares, I get confused, and sometimes snap into seeing A and B as the same shade.
Elaborating:
The shadow looks “pretty dark” to me. When I ask myself whether it is darker or lighter than the difference between light and dark squares, I get confused, and sometimes snap into seeing A and B as the same shade.