Where trees are widely spaced with clean, straight trunks they can form a partial screen or filter in the foreground. These views also offer safe vantage points, with a greater sense of being hidden from the external landscape. A path passing through dense forest and approaching its edge can exploit this device, contrasting the increasing light beneath the trees and the tantalizing view out. Filtered views can be used as an appetizer to other kinds of view, raising expectations in the walker’s mind.
These also use foreground features such as large trees or rocks to compose a view, add depth and give a sense of mystery or drama where parts of the view can be hidden from sight. Such framing can be quite narrow, helping to focus the line of sight.