chromatic adaptation, where light sensitivity of colours decreases with respect to time. Now, assuming you are outside your house at night. The surrounding is dark. Suddenly, you see yellowness from an artificial light in a neighbouring house. On the other hand, if you are in your house which is illuminated by artificial light for quite some time, you will not see the yellowness. When we adapt to a certain light after seeing it for some time, our sensitivity to that light decreases, so we are not really aware of it anymore.