Plastic expression in architecture is inconceivable without colour. Colour and light complete one another. Without colour architecture is expressionless, blind... If the Functionalists wish to suppress colour completely, then this merely proves that they never understood the importance of colour as an 'architectural' element, as a means of plastic expression, no matter whether used with iron, glass, or concrete.

In: his article: 'Space – time and colour', in 'De Stijl' Aubette Issue, series xv, 87-9, 1928, pp. 26-27