Yellowish blue

互补色的光重叠。 它们互相抵销，影子却留住了颜色。 我设置两个互补色的光源，对称地打在白幕上。互补色光源加叠后，原本的投射在白幕上的颜色会互相抵消，呈现白色。「负后像」是一个视觉生理现像。当我们凝视光或影像，负后像就会以互补色呈现。假设眼睛凝视黄色光源，眼前便会呈现蓝色，即黄色的互补色。 当外界刺激消失后，残影继续停留于视觉，心理学家称此为「后感觉」。 The complementary coloured light added on each other. They cancel out each other whereas the shadow captures it. I staged two complementary coloured artificial light source symmetrically for additivecolour mixing. In the RGB colour system, the primary colour blue mixed with thecomplementary colour yellow would give the white light. The complementary colour ofthe light comes from our experience of negative afterimage left in the retina. Negativeafterimage is a physiological phenomenon that a complementary colour of light is leftin one’s vision after one’s eyes are flashed with light. It is the visual version of thepsychologists called ‘after-sensation’. For instance, if one’s eyes are exposed to ayellow light, blue light would appear in the vision.