Looking at them [the metaphysical paintings of De Chirico, c. 1919] I had the sense of rediscovering something I had always known, just as when some event already seen opens up to us a whole realm of our own dream world, one that we have failed to see or comprehend, owing to a kind of censorship.

A banal fever hallucination, soon obliterated and forgotten; it didn't reappear in M's memory until about thirty years later (on 10 August 1925), as he sat alone on a rainy day in a little inn by the seaside, staring at the wooden floor which had been scored by years of scrubbing, and noticed that the grain had started moving of its own accord (much like the lines on the [imitation] mahogany board of his childhood). As with the mahogany board back then, and as with visions seen between sleeping and waking, the lines formed shifting, changing images, blurred at first but then increasingly precise. Max {Ernst] decided to pursue the symbolism of this compulsory inspiration and, in order to sharpen his meditative and hallucinatory skills, he took a series of drawings from the floorboards. Letting pieces of paper drop at random on the floor, he rubbed over them with a black pencil. On careful inspection of the impressions made in this way, he was surprised by the sudden increase they produced in his visionary abilities. His curiosity was aroused. He was delighted, and began making the same type of inquiry into all sorts of materials, whatever caught his eye – leaves with their ribs, the frayed edges of sacking, the strokes of a palette knife in a 'modern' painting, thread rolling off a spool, and so forth. To quote 'Beyond Painting' These drawings, the first fruits of the frottage technique, were collected under the title 'Histoire Naturell'.

One rainy day in Cologne on the Rhine, the catalogue of a teaching aids company caught my attention. It was illustrated with models of all kind – mathematical, geometrical, anthropological, zoological, botanical, anatomical, mineralogical, paleontological, and so forth- elements of such a diverse nature that the absurdity of the collection confused the eye and mind, producing hallucinations and lending the objects depicted new and rapidly changing meanings. I suddenly felt my 'visionary faculties' so intensified that I began seeing the newly emerged objects against a new background. To capture it, a little paint or a few lines were enough, a horizon, a sky, a wooden floor, that sort of things. My hallucination had been fixed. Now it was a matter of interpreting the hallucination in a few words or sentences Such as: 'Above the clouds midnight passes. Above midnight glides the invisible bird of day..'

A series of powers are at work within the great stream of Expressionism who have no outward similarity to one another but a common direction of thrust, namely the intention to give expression to things of the psyche [Seelisches] through form alone.