Les Fauves (French for wild beasts), a short-lived and loose grouping of early Modern artists artists, emphasized painterly qualities, and the use of deep color, over the representational values retained by Impressionism even with its focus on light and the moment.

Fauvists simplified lines, whist making the subject of the painting easy to read, and brightened the colors. Les Fauves paintings also feature flat patterns and anti-naturalism.

One of the fundamentals of the Fauves was expressed in 1888 by Paul Gauguin to Paul Sérusier:

- "How do you see these trees? They are yellow. So, put in yellow; this shadow, rather blue, paint it with pure ultramarine; these red leaves? Put in vermilion".

The name was given the group by an art critic following their 1905 seminal show in Paris. The painter Gustave Moreau was the movement's inspirational teacher, and a professor at the École des Beaux-Arts in Paris who pushed his students to think outside of the lines of formality and to follow their visions.

The leaders of the movement, Moreau's top students, were Henri Matisse and André Derain — friendly rivals of a sort, each with his own followers. The paintings, for example Matisse's 1908 The Dessert or Derain's The Two Barges, use powerful reds or other forceful colors to draw the eye. Matisse became the yang to Picasso's yin in the 20th century while time has trapped Derain at the century's beginning, a "wild beast" forever. Their disciples included Albert Marquet, Henri Manguin, Charles Camoin, the Belgian painter Henri Evenepoel, Jean Puy, Maurice de Vlaminck, Raoul Dufy, Emile-Othonriesz, Georges Rouault, the Dutch painter Kees van Dongen, and Picasso's partner in Cubism, Georges Braque.

Fauvism, as a movement, had no concrete theories, and was short lived (they only had three exhibitions). Matisse was seen as a leader of the movement. He said he wanted to create art to delight; art as a decoration was his purpose; therefore his use of bright colors tries to maintain serenity of composition.

Among those influenced by the movement were Gauguin and Vincent van Gogh, both of whom had begun using colors in a brighter more arbitrary manner.
(cf : Wikipedia)