That invisible substance, time

There is a plane geometry and a geometry of space. And so for me the novel is not only plane psycholoy but psychology in space and time. That invisible substance, time, I try to isolate. But in order to do this it was essential that the experience be continuous.

-- Proust, Marcel "Letters of Marcel Proust", translated by Mina Curtiss, Random House, New York, 1949, edition Helen Marx Books, 2006, pages 271-2