Naïve art[2] is often seen as outsider art which is without a formal (or little) training or degree. While this was true before the twentieth century, there are now academies for naïve art. Naïve art is now a fully recognized art genre, represented in art galleries worldwide.
The characteristics of naïve art are an awkward relationship to the formal qualities of painting, especially non-respect of the three rules of the perspective (such as defined by the Progressive Painters of the Renaissance):
decrease of the size of objects proportionally with distance,
muting of colors with distance,
decrease of the precision of details with distance,