The rectangular plane of varying dimensions and colours visibly demonstrates that internationalism does not mean chaos ruled by monotony but an ordered and clearly divided unity. In Neo-Plasticism, there are, in fact, very definite boundaries. But these boundaries are not really closed; the straight lines in rectangular opposition to one another constantly intersect, so that their rhythm continues throughout the whole work... These frontiers will be clearly defined but not 'closed'; there will be no customs, no work permits. 'Foreigners' will not be viewed as aliens.

In 'The New Art – The New Life', Piet Mondrian, op. cit. Introd. Note 1., 1931