It may look as if the two arms of the X use different shades of pink, but in fact the entire X uses a single color. Explanation: The difference is that one arm of the X consists of pink squares that replace white squares in the background. Thus these pink squares are surrounded by green squares. The other arm of the X also consists of pink squares, of an identical color, but in this case they replace green squares in the background, and are therefore surrounded by white squares causing a brighter appearance.

Questions / Comments