Question: When was "Hidden Faces" published?
About the article "Salvador Dalí", section "Literary works".

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 created by artists.
The Mannerist master at the 16th-century imperial Habsburg courts of Vienna and Prague, Giuseppe Arcimboldo of Milan was probably the best known artist for creating extraordinary hidden faces.
He arranged flowers, vegetables, fruits, shells, scallops and other animals, books and different things on the canvas in such a way that the whole collection of objects formed a portrait.
His series of The Four Seasons seems to be the first use of this approach and technique.
Arcimboldo's composite heads were celebrated and imitated by his contemporaries but they were relatively forgotten until participants in the twentieth-century art movements rediscovered them, bringing them to the attention of art historians.
He is considered as forerunner of Dada and Surrealism.
Some other famous Renaissance and Baroque artists created hidden faces like Leonardo da Vinci Albrecht Dürer Tobias Stimmer Hans Holbein the Younger Matthäus Merian Anna Maria Sibylla Merian John Martin Will Henrich Göding Marcus Gheeraerts the Elder Wenzel Hollar Henrich Ulrich Hans Meyer Josse de Momper Salvador Dalí was fascinated by the technique of Arcimboldo and his paranoia-critical method was influenced by the Mannerist painter.
For Dalí the Arcimboldo effect was form of self concealment as well as this exhibitionist painter seemed, all throughout his life of constant posturing, to hide his real self behind the gaudy externals of his behaviour.
Larvatus prodeo, "I wear a mask," he could have said with Descartes and he used this quotation from the French philosopher for the epigraph of his novel Hidden Faces.
Probably his most famous "hidden face" is Voltaire in his oil painting: Slave Market with the Disappearing Bust of Voltaire.
Other Surrealist painters rediscovered the technique of hidden faces in the first part of 20th century:  Max Ernst René Magritte Istvan Orosz tries to combine the technique of anamorphosis with the hidden faces.
Anamorphosis is used for those works of art that were made as distorted and unrecognizable through clever geometrical constructions.
But when viewed from a certain point, or through a reflecting object placed upon it, the hidden image appears in its true shape, that is, it goes through retransformation.
Orosz made experiments with anamorphoses not only in resurrecting the old technique but to improve and develop it.
Instead of having a meaningless distorted image, his intent is to bring sense to the basic anamorphic picture, giving it meaning in itself with its second reading being revealed by viewing it from a different viewpoint such as looking at it through a special mirror.
The ambiguous layers coming up by this approach make use of the connection or contrast of the two images within the same picture being independent from each other.
There are many other contemporary works using hidden faces: Bev Doolitte Shigeo Fukuda Octavio Ocampo Sandro del Prete<br clear=all>  
 Voiced By: Sherri Shepherd M.C.
A rapper loosely based on Queen Latifah, MC Lyte, and other female rappers.
She gave Kim a ride in her yacht for retrieving her demo tape when it got stolen in "Hidden Talent".
She made reappearances in "Rappin' Drakken" and "Trading Faces" when she was also framed by new villainess Camille Leon. 
There are everyday examples of hidden faces, they are "chance images" including faces in the clouds, figures of the Rorschach Test and the Man in the Moon.
Leonardo da Vinci wrote about them in his notebook: "If you look at walls that are stained or made of different kinds of stones you can think you see in them certain picturesque views of mountains, rivers, rocks, trees, plains, broad valleys, and hills of different shapes.
You can also find in them battles and rapidly moving figures, strange faces and costumes, as well as an infinite number of things."
Francois and Jean Robert collected and published a lot of photos of "chance faces".<br clear=all> 
People often see hidden faces in things.
Depending on the circumstances, this is referred to as pareidolia, the perception or recognition of a specific pattern or form in something essentially different.
It is thus also a kind of optical illusion.
When an artist notices that two different things have a similar appearance, and draws or paints a picture making this similarity evident he makes images with double meanings.
Many of these images are hidden faces or hidden skulls.
These illusionistic pictures present the viewer with a mental choice of two interpretations: head or landscape, head or objects, head or architecture, etc.
Both of them are valid, but the viewer sees only one of them and very often he cannot see both interpretations simultaneously. 
"Hidden Faces" replaced "Let's Make a Deal" at 1:30 PM (12:30 Central) after disputes between NBC and "Deal" packagers Stefan Hatos and Monty Hall caused "Deal" to move to ABC.
Facing the ABC "Deal" and CBS' "As the World Turns", "Hidden" performed poorly and, unusual for daytime serials in that era, was pulled after only six months in favor of the Bill Leyden-hosted game "You're Putting Me On".
"Hidden Faces" was the first of eight programs that NBC put in "Deal'"s timeslot between its departure and the expansion of "Days of our Lives" to an hour on April 21, 1975.
Of those eight shows, only "Three on a Match" lasted longer than a year.