Assumed / Presumed | An exploration of colour that reflects on a day in the life of yellow, red and blue; the three primary colours as suggested by the basic colour theory of Charles Hayter’s color diagram of 1826 - A New Practical Treatise on the Three Primitive Colours Assumed as a Perfect System of Rudimentary Information.Through the photographic exploration of natural light and of living objects; the lemon, the tomato and the sky, we see the changing colours of each throughout a day. Assumptions, dependencies and interruptions are many. The time of day, the interruption of a cloud, the chosen settings of a camera, the chosen paper to print on, the chosen printer, the perceptions and processing of our individual brains.