In Paris, I quickly mastered the Foxtrot, the Shimmy and the One Step, [he liked the Shimmy best:] At first, the heel-toe was sort of tricky. Nowaday… - Piet Mondrian

This new plastic idea will ignore the particulars of appearance, that is to say, natural form and color. On the contrary, it should find its expression in the abstraction of form and color, that is to say, in the straight line and the clearly defined primary color.

Quote of Mondrian in 'Natuurlijke en abstracte realiteit', Piet Mondriaan, in 'De Stijl' III, 1920, p. 75

the Cubists in Paris made me see that there was also a possibility of suppressing the natural aspect of form. I continued my research by abstracting the form and purifying the colour more and more. While working, I arrived at suppressing the closed effect of abstract form, expressing myself exclusively by means of the straight line in rectangular opposition; thus by rectangular planes of colour with white, grey and black. At that time, I encountered artists with approximately the same spirit, First Van der Leck, who, though still figurative, painted in compact planes of pure colour. My more or less cubist technique - in consequence still more or less picturesque - underwent the influence of his exact technique. Shortly afterwards I had the pleasure of making the acquaintance of Van Doesburg. Full of vitality and zeal for the already international movement that was called 'abstract', and most sincerely appreciative of my work, he came to ask me to collaborate in a review he intended to publish, and which he [Theo van Doesburg] was to call 'De Stijl'. I was happy with an opportunity to publish my ideas on art, which I was engaged in writing down: I saw the possibility of contacts with similar efforts.