The Flammarion engraving is a wood engraving by an unknown artist, so named because its first documented appearance is in Camille Flammarion's 1888 book L'atmosphère: météorologie populaire ("The Atmosphere: Popular Meteorology"). The engraving has often, but erroneously, been referred to as a woodcut. It has been used to represent a supposedly medieval cosmology, including a flat earth bounded by a solid and opaque sky, or firmament, and also as a metaphorical illustration of either the scientific or the mystical quests for knowledge.
The engraving depicts a man, clothed in a long robe and carrying a staff, who kneels down and passes his head, shoulders, and right arm through a gap between the starry sky and the earth, discovering a marvellous realm of circling clouds, fires and suns beyond the heavens. One of the elements of the cosmic machinery bears a strong resemblance to traditional pictorial representations of the "wheel in the middle of a wheel" described in the visions of the Hebrew prophet Ezekiel. One of the most significant features of the landscape is the tree, which some people have interpreted as the Kabbalistic Tree of Life.
The caption that accompanies the engraving in Flammarion's book reads:
A missionary of the Middle Ages tells that he had found the point where the sky and the Earth touch...
In 1957, astronomer Ernst Zinner claimed that the image dated to the German Renaissance, but he was unable to find any version published earlier than 1906. Further investigation, however, revealed that the work was a composite of images characteristic of different historical periods, and that it had been made with a burin, a tool used for wood engraving only since the late 18th century. The image was traced to Flammarion's book by Arthur Beer, an astrophysicist and historian of German science at Cambridge and, independently, by Bruno Weber, the curator of rare books at the Zürich central library.
Flammarion had been apprenticed at the age of twelve to an engraver in Paris and it is believed that many of the illustrations for his books were engraved from his own drawings, probably under his supervision. Therefore it is plausible that Flammarion himself created the image, though the evidence for this remains circumstantial. Like most other illustrations in Flammarion's books, the engraving carries no attribution. Although sometimes referred to as a forgery or a hoax, Flammarion does not characterize the engraving as a medieval or renaissance woodcut, and the mistaken interpretation of the engraving as an older work did not occur until after Flammarion's death. The decorative border surrounding the engraving is distinctly non-medieval and it was only by cropping it that the confusion about the historical origins of the image became possible.
According to Bruno Weber and to astronomer Joseph Ashbrook, the depiction of a spherical heavenly vault separating the earth from an outer realm is similar to the first illustration in Sebastian Münster's Cosmographia of 1544, a book which Flammarion, an ardent bibliophile and book collector, might have owned.
Context in Flammarion's book 
In Flammarion's L'atmosphère: météorologie populaire, the image refers to the text on the facing page (p. 163), which also clarifies the author's intent in using it as an illustration:
Whether the sky be clear or cloudy, it always seems to us to have the shape of an elliptic arch; far from having the form of a circular arch, it always seems flattened and depressed above our heads, and gradually to become farther removed toward the horizon. Our ancestors imagined that this blue vault was really what the eye would lead them to believe it to be; but, as Voltaire remarks, this is about as reasonable as if a silk-worm took his web for the limits of the universe. The Greek astronomers represented it as formed of a solid crystal substance; and so recently as Copernicus, a large number of astronomers thought it was as solid as plate-glass. The Latin poets placed the divinities of Olympus and the stately mythological court upon this vault, above the planets and the fixed stars. Previous to the knowledge that the earth was moving in space, and that space is everywhere, theologians had installed the Trinity in the empyrean, the glorified body of Jesus, that of the Virgin Mary, the angelic hierarchy, the saints, and all the heavenly host.... A naïve missionary of the Middle Ages even tells us that, in one of his voyages in search of the terrestrial paradise, he reached the horizon where the earth and the heavens met, and that he discovered a certain point where they were not joined together, and where, by stooping his shoulders, he passed under the roof of the heavens...
The same paragraph had already appeared, without the accompanying engraving, in an earlier edition of the text published under the title of L'atmosphère: description des grands phénomènes de la Nature ("The Atmosphere: Description of the Great Phenomena of Nature," 1872). The correspondence between the text and the illustration is so close that one would appear to be based on the other. Had Flammarion known of the engraving in 1872, it seems unlikely that he would have left it out of that year's edition, which was already heavily illustrated. The more probable conclusion therefore is that Flammarion commissioned the engraving specifically to illustrate this particular text, though this has not been ascertained conclusively.
Literary sources 
The idea of the contact of a solid sky with the earth is one that repeatedly appears in Flammarion's earlier works. In his Les mondes imaginaires et les mondes réels ("Imaginary Worlds and Real Worlds," 1864), he cites a legend of a Christian saint, Macarius the Roman, which he dates to the 6th century. This legend includes the story of three monks (Theophilus, Sergius, and Hyginus) who "wished to discover the point where the sky and the earth touch" (in Latin: ubi cœlum terræ se conjungit). After recounting the legend he remarks that "the preceding monks hoped to go to heaven without leaving the earth, to find 'the place where the sky and the earth touch,' and open the mysterious gateway which separates this world from the other. Such is the cosmographical notion of the universe; it is always the terrestrial valley crowned by the canopy of the heavens."
In the legend of St. Macarius, the monks do not in fact find the place where earth and sky touch. In Les mondes imaginaires Flammarion recounts another story:
This fact reminds us of the tale which Le Vayer recounts in his Letters. It appears that an anchorite, probably a relative of the Desert Fathers of the East, boasted of having been as far as the end of the world, and of having been obliged to stoop his shoulders, on account of the joining of the sky and the earth in that distant place.
Flammarion also mentioned the same story, in nearly the same words, in his Histoire du Ciel ("History of the Sky"):
"I have in my library," interrupted the deputy, "a very curious work: Levayer's letters. I recall having read there of a good anchorite who bragged of having been 'to the ends of the earth,' and of having been obliged to stoop his shoulders, because of the union of the sky and of the earth at this extremity."
The Letters referred to are a series of short essays by François de La Mothe Le Vayer. In letter 89, Le Vayer, after mentioning Strabo's scornful opinion of Pytheas's account of a region in the far north where land, sea, and air seemed to mingle in a single gelatinous substance, adds:
That good anchorite, who boasted of having been as far as the end of the world, said likewise, that he had been obliged to stoop low, on account of the joining of the sky and earth in that distant region.
Le Vayer does not specify who this "anchorite" was, nor does he provide further details about the story or its sources. Le Vayer's comment was expanded upon by Pierre Estève in his Histoire generale et particuliere de l'astronomie ("General and Particular History of Astronomy," 1755), where he interprets Le Vayer's statement (without attribution) as a claim that Pytheas "had arrived at a corner of the sky, and was obliged to stoop down in order not to touch it."
The combination of the story of St. Macarius with Le Vayer's remarks seems to be due to Flammarion himself. It also appears in his Les terres du ciel ("The Lands of the Sky"):
With respect to the bounds (of the Earth)... some monks of the tenth century of our era, bolder than the rest, say that, in making a voyage in search of the terrestrial paradise, they had found the point where the heaven and earth touch, and had even been obliged to lower their shoulders!
Later uses and interpretations 
The Flammarion engraving was used as an illustration in C. G. Jung's Flying Saucers: A Modern Myth of Things Seen in the Skies (1959), and in The Mathematical Experience (1981) by Philip J. Davis and Reuben Hersh. It served as the cover illustration for Daniel J. Boorstin's The Discoverers a bestselling account of the history of science (1983), Richard Sorabji's Matter, Space & Motion: Theories in Antiquity and Their Sequel (1988), Ernest Holmes' "Love & Law" (2001), Stephan Hoeller's Gnosticism: New Light on the Ancient Tradition of Inner Knowing (2002), Gunther Stent's Paradoxes of Free Will (2002), and more recently for William T. Vollmann's Uncentering the Earth: Copernicus and On the Revolutions of the Heavenly Spheres (2006) and Priscilla Costello's "Practical Astrology" (2008). Donovan's 1973 LP, Cosmic Wheels, had a copy in its inner sleeve. Electropostpunkadelic group Alice Sweet Alice (2011) of Kansas City, Missouri, used the illustration for various websites and merchandise.
Some commentators have claimed that Flammarion produced the image to propagandize the myth that medieval Europeans widely believed the Earth to be flat. In his book, however, Flammarion never discusses the issue of the shape of the Earth. His text suggests that the image is simply a fanciful illustration of the false view of the sky as an opaque barrier.
See also 
- Flammarion, Camille (1888). L'atmosphère: météorologie populaire. Paris: Hachette. p. 163. The text is also available here.
- Ernst Zinner, in Börsenblatt für den Deutschen Buchhandel, Frankfurt, 18 March 1957.
- Bruno Weber, in Gutenberg-Jahrbuch, pp. 381-407 (1973).
- Joseph Ashbrook, "Astronomical Scrapbook: About an Astronomical Woodcut," Sky & Telescope, 53 (5), pp. 356-407, May 1977.
- The image is shown here
- Flammarion, Camille (1873). The Atmosphere. New York. p. 103.
- Flammarion, Camille (1872). L'atmosphère: description des grands phénomènes de la Nature. Paris. p. 138.
- Flammarion, Camille (1865). Les mondes imaginaires et les mondes réels. Paris. p. 246.
- De Vitis Patrum Liber Primus. Paris. 1860. p. 415.
- The legend of St. Macarius may be read in English translation at Vitae Patrum.
- Flammarion, Camille (1865). Les mondes imaginaires et les mondes réels. Paris. p. 328.
- Flammarion, Camille (1872). Histoire du Ciel. Paris. p. 299.
- de La Mothe Le Vayer, François (1662). Oeuvres de François de La Mothe Le Vayer, Volume 3. Paris. p. 777.
- Estève, Pierre (1755). Histoire generale et particuliere de l'astronomie. Paris. p. 242.
- Flammarion, Camille (1884). Les terres du ciel. Paris. p. 395.
- See, e.g., here, and here