To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

From Wikipedia, the free encyclopedia

Use of periaktos in 17th century theater. In: Architectura recreationis, by J. Furttenbach
Use of periaktos in 17th century theater. In: Architectura recreationis, by J. Furttenbach

A periaktos (plural form periaktoi, from a Greek word meaning revolving) is a device used for displaying and rapidly changing theatre scenes. It was first mentioned in Vitruvius's book on architecture, De architectura (c. 14 BC), 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.

A small tabletop model of a theatre set. In the center is a gateway entrance with two large periaktoi on either side, painted to show a country side scene, and a Greek temple in the distance.
A tabletop model of a set with two periaktoi

A series of periaktoi positioned one after the other along the stage's depth can produce the illusion of a longer scene, composed by its faces as seen in perspective. These periaktoi must therefore be rotated simultaneously to a new position, thus achieving interesting illusions. This is made by coupling them by using sprocket gears at their bases and a flat chain or conveyor belt mechanical transmission system. A similar concept is used in some modern Trivision multi-message billboards, which are made up of a series of triangular prisms arranged so that they can be rotated to present three separate flat display surfaces in succession.

Early motion picture mechanical devices, such as the praxinoscope, were also based on rapidly rotating solid polygons, which had the successive animation or photographic plates affixed or projected to each face, thus providing the optical illusion of movement.

YouTube Encyclopedic

  • 1/3
    9 709
    2 195
    2 253
  • Sabbatini's Periaktoi System of Scene Changing - View
  • Sabbatini's Wing and Groove System of Scene Changing - View
  • Sabbatini's Periaktoi System of Scene Changing - Plan


See also

External links

This page was last edited on 22 May 2021, at 23:14
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.