Final answer:
Outsider, naïve, and folk art are created by artists with no formal training or experience.
Explanation:
Outsider art, also known as naïve art or folk art, refers to art created by artists with no formal training or experience. These artists often work in a style that is fresh, amateurish, and characterized by a lack of adherence to traditional artistic rules. Examples of artists working in this style include Henri Rousseau and Grandma Moses.
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