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
