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1. Sculpture refers to a type of visual art which is three dimensional in nature. There are different types of sculpture which can be made by man. A sculpture made by man can be formed using stones, woods, metals, ceramics, clay, etc. A natural sculpture is a type of sculpture which is inspired by forms and processes from nature.
2. The forms of processes that exist in nature are: geographical changes, seasons, weather conditions, life cycles, metamorphosis and so on. These processes can inspire a natural form of sculpture. For instance, limestone that had been eroded with water usually formed a kind of sculpture known as contemplation stones.
As a style, realism doesn't adhere to classical rules.
Instead, artists paint what they see, often using everyday observations as their
subjects. It attempts to represent the subject in a truthful manner and
without any artificiality and usually avoids anything that is implausible.