In 1874, a group of revolutionary painters decided that painting was not exactly duplicating exactly what was out there. For them, painting was what they felt and their impressions of what was before them. Trees were painted blue, red, orange or any other color that impressed them while carrying out the painting. Their work represented the impressions of the subject on their conscience.
They were called “The Impressionists”. Scorned, rejected, hated and critized, they formed a separate group and exhibited their work in special exhibition rooms known as “the rejected paintings”. They couldn’t care less. Their movement continued and grew as time passed by. Some of these art revolutionaries were: Picasso, Dalí, Manet, Monet, Renoir, Pissaro, Degas, Sisley, Morisot, Gaugin, and Cézanne.
Their work is recognized today for its modernity, embodied in its rejection of established styles, the incorporation of new technology and ideas, and its depiction of modern life.
In art there are no rigid rules, and anything if fair game.