L'œil du prince (French: [l‿œjdypʁɛ̃s] ; English: "the prince's eye") is a French expression popularized by Nicola Sabbatini (1574–1654), an Italian stage designer and architect of the Renaissance in his famous treatise published in 1638. It is an imaginary point in the audience of a theatre, located in its central axis, approximately 0.6 m (18 inches) above the stage, and at a distance equal to the stage's width. In most theaters it corresponds more or less to the seventh row of seats. Sabbatini, in a chapter in his book, describes ‘How to Place the Prince’s Seat’, where "all the objects in the scene appear better... than from any other place". It is considered the best place and the most coveted one in the audience, which was reserved for the nobility (thus the reference to the prince). Due to the importance of these spectators, of course, many theater shows had their main movements and happenings designed in order to attract the attention of the prince's eye.
The usefulness of this point is that it permits the stage designer to calculate the perspective angles of the scenes (decoration) on the stage, as viewed from a central place (the focal point). Beginning in the 17th century, Italian theatrical decoration became very influential in the use of constructions in perspective, which added greater realism to depth perception by the audience. Thus, it satisfied the baroque ideal of opening towards the infinity. Sabbatini and others also invented the scene wings which run on grooves in the floor, allowing a quicker change of decorations during the intermissions. These innovations produced what became known as the scènes à l’italienne in theatres in Italy, France and elsewhere in Europe.
In a metaphorical sense, the French language also uses the expression to typify any privileged view of an observer (such as in "he had the eye of the prince when he was covering Iraq's war"), or also in a way of acting so as to please the privileged observer (such as in "he tried to conquer the eye of the prince in his report").
The Baroque is a Western style of architecture, music, dance, painting, sculpture, poetry, and other arts that flourished from the early 17th century until the 1750s. It followed Renaissance art and Mannerism and preceded the Rococo and Neoclassical styles. It was encouraged by the Catholic Church as a means to counter the simplicity and austerity of Protestant architecture, art, and music, though Lutheran Baroque art developed in parts of Europe as well.

The following outline is provided as an overview of and topical guide to theatre:
Stagecraft is a technical aspect of theatrical, film, and video production. It includes constructing and rigging scenery; hanging and focusing of lighting; design and procurement of costumes; make-up; stage management; audio engineering; and procurement of props. Stagecraft is distinct from the wider umbrella term of scenography. Considered a technical rather than an artistic field, it is primarily the practical implementation of a scenic designer's artistic vision.
In theatre and performing arts, the stage is a designated space for the performance of productions. The stage serves as a space for actors or performers and a focal point for the audience. As an architectural feature, the stage may consist of a platform or series of platforms. In some cases, these may be temporary or adjustable but in theaters and other buildings devoted to such productions, the stage is often a permanent feature.
A theater, or playhouse, is a structure where theatrical works, performing arts, and musical concerts are presented. The theater building serves to define the performance and audience spaces. The facility usually is organized to provide support areas for performers, the technical crew and the audience members, as well as the stage where the performance takes place.
17th-century French literature was written throughout the Grand Siècle of France, spanning the reigns of Henry IV of France, the Regency of Marie de' Medici, Louis XIII of France, the Regency of Anne of Austria and the reign of Louis XIV of France. The literature of this period is often equated with the Classicism of Louis XIV's long reign, during which France led Europe in political and cultural development; its authors expounded the classical ideals of order, clarity, proportion and good taste. In reality, 17th-century French literature encompasses far more than just the classicist masterpieces of Jean Racine and Madame de La Fayette.
An overview of the history of theatre of France.
Rocaille was a French style of exuberant decoration, with an abundance of curves, counter-curves, undulations and elements modeled on nature, that appeared in furniture and interior decoration during the early reign of Louis XV of France. It was a reaction against the heaviness and formality of the Louis XIV style. It began in about 1710, reached its peak in the 1730s, and came to an end in the late 1750s, replaced by Neoclassicism. It was the beginning of the French Baroque movement in furniture and design, and also marked the beginning of the Rococo movement, which spread to Italy, Bavaria and Austria by the mid-18th century.
Nicola Sabbatini, also known as Niccolò Sabbatini or Nicola Sabbattini, was an Italian architect of the Baroque.
A periaktos is a device used for displaying and rapidly changing theatre scenes. It was first mentioned in Plato's Republic, in the story, "Allegory of a Cave", but its most intense use began in Renaissance theatre, as a result of the work of important theatrical designers, such as Nicola Sabbatini (1574–1654). It consists of a revolving solid equilateral triangular prism made of wood. On each of its three faces, a different scene is painted, so that, by quickly revolving the periaktos, another face can appear to the audience. Other solid polygons can be used, such as cubes, but triangular prisms offer the best combination of simplicity, speed and number of scenes per device.
The Galli–Bibiena family, or Galli da Bibiena, was a family of Italian artists of the 17th and 18th centuries, including:
Giuseppe Galli Bibiena , Italian designer, became the most distinguished artist of the Galli da Bibiena family.
The Teatro San Cassiano was the world's first public opera house, inaugurated as such in 1637 in Venice. The first mention of its construction dates back to 1581. The name with which it is best known comes from the parish in which it was located, San Cassiano, in the Santa Croce district (‘sestiere’) not far from the Rialto.

Giacomo Torelli was an Italian stage designer, scenery painter, engineer, and architect. His work in stage design, particularly his designs of machinery for creating spectacular scenery changes and other special effects, was extensively engraved and hence survives as the most complete record of mid-seventeenth-century set design.
The Royal Opera of Versailles is the main theatre and opera house of the Palace of Versailles. Designed by Ange-Jacques Gabriel, it is also known as the Théâtre Gabriel. The interior decoration by Augustin Pajou is constructed almost entirely of wood, painted to resemble marble in a technique known as faux marble. The excellent acoustics of the opera house are at least partly due to its wooden interior.
The French formal garden, also called the jardin à la française, is a style of "landscape" garden based on symmetry and the principle of imposing order on nature. Its epitome is generally considered to be the Gardens of Versailles designed during the 17th century by the landscape architect André Le Nôtre for Louis XIV and widely copied by other European courts.
The Baroque garden was a style of garden based upon symmetry and the principle of imposing order on nature. The style originated in the late-16th century in Italy, in the gardens of the Vatican and the Villa Borghese gardens in Rome and in the gardens of the Villa d'Este in Tivoli, and then spread to France, where it became known as the jardin à la française or French formal garden. The grandest example is found in the Gardens of Versailles designed during the 17th century by the landscape architect André Le Nôtre for Louis XIV. In the 18th century, in imitation of Versailles, very ornate Baroque gardens were built in other parts of Europe, including Germany, Austria, Spain, and in Saint Petersburg, Russia. In the mid-18th century the style was replaced by the less geometric and more natural English landscape garden.
Féerie, sometimes translated as "fairy play", was a French theatrical genre known for fantasy plots and spectacular visuals, including lavish scenery and mechanically worked stage effects. Féeries blended music, dancing, pantomime, and acrobatics, as well as magical transformations created by designers and stage technicians, to tell stories with clearly defined melodrama-like morality and an extensive use of supernatural elements. The genre developed in the early 19th century and became immensely popular in France throughout the nineteenth century, influencing the development of burlesque, musical comedy and film.
Theatre in the nineteenth century was noted for its changing philosophy, from the Romanticism and Neoclassicism that dominated Europe since the late 18th century, to Realism and Naturalism in the latter half of the 19th century, before it eventually gave way to the rise of Modernism in the 20th century. Scenery in theater at the time closely mirrored these changes and with the onslaught of the Industrial Revolution and technological advancement throughout the century, dramatically changed the aesthetics of the theater.
Theatre in the nineteenth century was noted for its changing philosophy from the Romanticism and Neoclassicism that dominated Europe since the late 18th century to Realism and Naturalism in the latter half of the 19th century before it eventually gave way to the rise of Modernism in the 20th century. Scenery in theater at the time closely mirrored these changes, and with the onset of the Industrial Revolution and technological advancement throughout the century, dramatically changed the aesthetics of the theater.