# Colour Constancy and Discrimination, Rev. 3 Will Davies **Opening (not a real abstract):** Colour Constancy and Discrimination Imagine that you are sat at your office desk drinking coffee from your favourite cobalt blue mug. The room is lit by fluorescent lights. The mug looks or appears cobalt blue to you. Tiring of the artificial light, you take your drink outside to enjoy the hazy afternoon sunlight. Despite the marked difference in the composition of the light once outdoors, your mug appears more or less exactly the same shade of cobalt blue to you. Such occurrences are commonplace: for most objects and most lighting conditions that we ordinarily encounter (barring complete darkness, in which all bets are off), objects will appear approximately the same in respect of colour when viewed under different illuminants. We are all aware of this fact on some level. Guided, reflective, introspection on visual experience in carefully constructed cases may serve **Authors:** [[Colour Constancy and Discrimination]]