Ozenfant’s revised thoughts on the importance of colour were partly due to the influence of the artist Paul Signac and his theories on Divisionism. Signac maintained that the Neo-Impressionist technique of applying brushstrokes obtained the maximum brightness, colour, and harmony. Unlike the techniques used by the earlier Impressionists, patches of colours remained distinct, blending when viewed at a distance. In this instance, when no fusion of the colours takes place, the interaction is called “simultaneous contrast”, a condition in which colours merely influence one another by proximity. This technique prevents the muddiness or darkening that result when patches of colour actually run into each other. It was an extension of this technique that was recommended by Ozenfant for achieving “colour solidity” in architecture, altering colours visually by contrast to create the illusion of solidity.