When working on a bonsai, the specialist must have a general goal to refer to, while following through the formation and education of the plant. This goal is a project that should focus on the representation of nature. The specialist should be careful to respect, for example, trunk orientation, branching direction, shape of the crown, and any other elements that the arboreal species would have in nature. For this reason, the first and foremost source of learning for a specialist is the observation of nature itself. The following is a list of some of the most famous bonsai styles. Although some bonsai may have elements of multiple styles, the best practice is to refer to it by its dominant characteristics.