Editing RYB color model (section)

=== Old model of coloration with four primaries ===
The ancient Greeks, under the influence of [[Aristotle]], [[Democritus]] and [[Plato]], considered that there were four basic colors that coincided with the [[four elements]]: earth ([[ochre]]), sky (blue), water (green) and fire (red), while black and white represented the light of day and the darkness of night. {{Citation needed|reason=Seems counter to Artistotle's On Colors, Plato's Timaeus, etc.|date=April 2023}} The four-color system is formed by the primaries yellow, green, blue and red, and was supported by [[Leon Battista Alberti|Alberti]] in his "[[De pictura|De Pictura]]" (1436), using the rectangle, rhombus, and  [[color wheel]] to represent them.
[[File:Traité de la peinture, 1708.png|thumb|[[Color Circle]] from 1708, based on the primary colors blue, red, and yellow<ref>Traité de la peinture en mignature (The Hague, 1708), reproduced at [http://www.gutenberg-e.org/lowengard/A_Chap03.html The Creation of Color in Eighteenth-Century Europe]</ref>]]

[[Leonardo da Vinci]] endorsed this model in 1510, although he hesitated to include green, noting that green could be obtained by mixing blue and yellow. Also Richard Waller, in his "Catalogue of Simple and Mixed Colors" (1686), graphed these four colors in a square.<ref>[http://www.colorsystem.com/?page_id=676&lang=en Richard Waller] Color System</ref> These four colors have often been referred to as "the primary psychological colors".<ref>MS Sharon Ross, Elise Kinkead (2004). [http://www.benjaminmoore.com/en-us/for-your-home/faux-and-decorative-finishes Decorative Painting & Faux Finishes]. Creative Homeowner. ISBN 1-58011-179-3.</ref>