Styles as classifications
The Japanese have codified the art of Bonsai through the observation of nature, which enabled them to classify trees according to the shape of their trunk into "styles" . There are five basic styles for bonsai: formal upright, informal upright, cascade, semi-cascade and slanted. These classifications are based on two things. The first point is the overall shape of the tree. The second point is how much the trunk tilts away from the vertical axis of the tree.
Informal upright - Moyogi or Tachiki
It is a very widespread style and any beginner should "try it out". The trunk emerges from the ground with a pronounced angle and then is sinuous rising towards the top. The curves should shrink to the top and should not be equal, neither in angle nor in shape. The branches should, if possible, be inserted outside the curves, never inside. The first three branches are placed as on the formal right, from the first third (first branch, back branch, second branch, or first, second branch, back branch). The back branch will never be the first branch.
Slanted - Shakan
The trunk is bent at 45 to 70 degrees and can be winding. The roots are more prominent on one side of the tree to keep the tree in balance. That means the roots on the other side of the tree are less developed. The branches must be well styled horizontally in order to counter the impression of instability. This style is particularly suitable for conifers, the branches having to be slightly drooping. It differs from the style "Windswept - Fukinagashi" because of the fact that its branches are located on both sides of the trunk. In the windswept style the branches are all located on one side of the tree.