Another useful technique is to relax the gaze rather than concentrating intensely on one tiny area. People sometimes respond to a difficult visual puzzle by staring harder and harder at the place where they expect the answer to appear. That can become counterproductive if attention remains locked onto the wrong features. Looking at the image more broadly can make it easier to notice relationships between distant parts of the scene. A hidden face may extend across a larger portion of the forest than expected, so examining individual branches separately can prevent the viewer from recognizing how they connect visually.
The deer can also be deliberately ignored or temporarily covered. Because it is such an obvious object, the eye may repeatedly return to it even after the viewer decides to search somewhere else. Covering that portion of the image removes one of the strongest competitors for attention. The remaining forest can then be examined without the animal constantly pulling the gaze back toward the center of interest. This technique does not guarantee that the hidden face will appear, but it changes the visual competition within the picture.
Light and shadow deserve particularly careful attention. Hidden-image designs often depend on boundaries between brighter and darker areas because those boundaries can imitate the edges normally used to recognize objects. Snow naturally provides broad areas of brightness, while trees and shadows create darker regions. When 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 beside it supplies another facial feature. The effectiveness of the puzzle depends on preserving both interpretations. If the branches looked too obviously like facial features from the beginning, there would be little challenge.
Snow is equally important because apparently empty areas are not necessarily visually meaningless. A pale region can become the interior of a larger shape when surrounded by carefully positioned darker elements. The viewer may initially treat snow as blank background because large white surfaces appear throughout the picture. Once the hidden face is recognized, however, some of those same pale areas may suddenly appear essential to its structure. Nothing physically changes in the image; only the interpretation changes.
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