Grosseteste is now believed to have had a very modern understanding of light and colour, which is shown by his scientific treatises De Luce (On Light) and De Colore (On Colour). De Luce explores the nature of light, matter, and the cosmos. He argued that light is an infinitely small particle which was the first form of everything within the universe that multiplied itself indefinitely that resulted in a finite magnitude which was physical matter. Grosseteste described the birth of the Universe in an explosion and the crystallisation of light into matter to form stars and planets in a set of nested spheres around Earth. He also came to the conclusion that, as light dragged the matter of the universe outward and expanded the universe, the density must decrease as the radius increases. Thus, invoking a conservation law centuries before conservation laws became fundamental in modern science. De Luce is the first attempt to describe the heavens and Earth using a single set of physical laws, four centuries before Isaac Newton proposed gravity and seven centuries before the Big Bang theory. In his treatise, De Colore, Robert Grosseteste had defined colour as light incorporated in a diaphanous material. Meaning that colour is associated with the interaction of light and materials and that it is a product of variations in the qualities of both the light and the medium. De Colore was Grosseteste's replacement of Aristotle's linear colour arrangement between black and white to a three dimensional one based on the aforementioned aspects with 7 different directions of colour from white to black with infinite variations in intensity.