After spending hours working at a computer display, look at a blank piece of white paper. It will probably appear ----.

After prolonged computer use, white paper may appear pinkish due to the complementary color effect. The blue light from displays causes fatigued photoreceptors, creating a yellowish/pinkish afterimage when looking at white. However, this effect is subjective and varies - some see yellow, others pink. The question assumes pink is the only correct answer.