"Regard the light and you are fascinated - practically inhibited from grasping its limits at each end. While the tube itself has an actual length...its shadow cast from the supporting pan has but illusively dissolving ends. This waning cannot really be measured without resisting consummate visual effects. Realizing this, I knew that the actual space of a room could be disrupted and played with by careful, thorough composition of the illuminating equipment. For example if a 244cm (8ft) fluorescent lamp be pressed into a vertical corner, it can completely eliminate that definite juncture by physical structure, glare and doubled shadow. A section of wall can be visually disintegrated into a separated triangle by placing diagonal of light from edge to edge on the wall: that is, side to floor, for instance"

Dan Flavin, quoted in "...in daylight or cool white" lecture, Brooklyn Museum School of Art, New York, December 18, 1964, published in ArtForum, December 1965