In the early Purist manifestoes, colour was deemed secondary to form, and this could be seen in the careful placing of colour to reinforce discrete architectural elements by Le Corbusier in his work of the mid-1920s. However, by the time he was in England, Ozenfant had refined his ideas about colour and outlined many of these in the six articles on the subject that he wrote for the "Architectural Review". Colour was now regarded as an essential element of architecture, rather than something considered by the architect while his work was being erected. Ozenfant believed that colour always modifies the form of the building and should receive more careful attention. We must endeavour to introduce a little order into this business, or at least sense into a great deal of it. But what is sense without order? We must try to find some method of arriving at some sort of order—one that will at least enable us to escape from this vagueness in the design of colour.