When I was young I once found a book in a Dutch translation, The 'Leaves of Grass'. It was the first time a book touched me by its feeling of freedom and open spaces, the way the poet spoke of the ocean by describing a drop of water in his hand. Walt Whitman was offering the world an open hand (now we call it democracy) and my 'Monument for Walt Whitman' became this open hand with mirrors, so you can see inside yourself.

The Cobra group started new, and first of all we threw away all these things we had known and started afresh, like a child — fresh and new. Sometimes my works look very childish, or childlike, schizophrenic or stupid, you know. But that was the good thing for me. Because, for me, the material is the paint itself. The paint expresses itself. In the mass of paint, I find my imagination and go on to paint it.

When you get older as a painter and you've got the opportunities, the talent and the good fortune and have been provided with everything for getting old, then it's fantastic, because the same brushstroke that you put down is more mature and more poignant than it was when you were young.

My paint is like a rocket, which describes its own space. I try to make the impossible possible. What is happening I cannot foresee, it is a surprise. Painting, like passion, is an emotion full of truth and rings a living sound, like the roar coming from the lion's breast.

My work is in a complete transformation. Lately, in my studio in Amsterdam, 'beings' re-emerge more and more, but I have repainted all the canvases that I have brought with me [from Amsterdam to Paris]. It is matter itself. On the canvas, no discovery, no personal drama, no submission to a rhythm.. ..freed from 'Victory Boogiewoogie' [title of the last work of Piet Mondrian, 1944], bepop, bepop, we free ourselves from rhythm, we are not there yet, but it is coming.. .Now I paint stains, bigger stains, colours endlessly reapplied one upon the other, I scrape and I put down new stains of colour unto nothing remains but one great plane, concentrated and linked at the same time, suddenly a vivid red or yellow and the canvas and being merge.

Now we'll start the song of the wild man who lives on the mountain top, who does not want to be seen
let us now start that song without words, without music, come on..
(let's not do anything for at least ten minutes)
That's the spirit, there he comes, the song of the inner voice, the song of the primitive man

I'm able to paint so nice and thick with those big splodges that stay upright because I mix my own paint. I use the formula that the seventeenth-century painters used and I've added one or two things myself. A very important element is stand oil. I once got hold of a whole barrel full and I'm still using it. There are pots of it in all my studios, in New York, in Connecticut, in Monaco, and in Tuscany. [the oil had been found when an old paint shop closed down, in a] stock that had been there since the seventeenth century.. .I mix my oil paint with it, and I throw in a lot of eggs and some concentrated turpentine. It's as thick as homemade mayonnaise. When it dries it is as tough and hard as rubber.