those contrasts are arranged appropriately, the transition between them can suggest facial features even though nothing has actually been drawn as a conventional portrait. What appears to be a shadow in one interpretation can become part of a face in another.
Branches can perform several roles simultaneously. In the ordinary forest interpretation, they are simply parts of trees. In the hidden interpretation, their angles and curves may suggest eyebrows, hair, wrinkles or the outline of a nose. A vertical trunk might resemble the boundary of a head, while the space
