The figure defined by the illusory watercolor appears dense and slightly elevated.When the colors of the double contour are reversed, the same region appears a cold white and slightly recessed.

• 由这种错觉水彩画出的图形，看来较为致密且稍稍凸起，将这双层轮廓的颜色互换之后，则同样的区域看起来会较冷白且稍稍凹陷下去。