To me, grey is the welcome and only possible equivalent for indifference, noncommitment, absence of opinion, absence of shape. But grey, like formlessness and the rest, can be real only as an idea, and so all I can do is create a colour nuance that means grey but is not it. The painting is then a mixture of grey as a fiction and grey as a visible, designated area of colour.

But my motivation was more a matter of wanting to create order - to keep track of things. All those boxes full of photographs and sketches weigh you down, because they have something unfinished, incomplete, about them. So it's better to present the usable material in an orderly fashion and throw the other stuff away. That's how the Atlas came to be, and I exhibited it a few times.

I believe that art has a kind of rightness, as in music, when we hear whether or not a note is false

The truth... When they have a similar structure to and are organized in as truthful a way as nature. When I look out of the window, then truth for me is the way nature shows itself in its various tones, colours and proportions. That's a truth and has its own correctness. This little slice of nature, and in fact any given piece of nature, represents to me an ongoing challenge, and is a model for my paintings.

Art is not a substitute religion: it is a religion (in the true sense of the word: 'binding back', 'binding' to the unknowable, transcending reason, transcendent being). But the church is no longer adequate as a means of affording experience of the transcendental, and of making religion real - and so art has been transformed from a means into the sole provider of religion: which means religion itself.

Without form, communication stops... without form, you have everybody burbling on to themselves, whenever and however, things that no one else can understand and - rightly - no one else is interested in.

It is a danger to wait around for an idea to occur to you. You have to find the idea.