This is the logo for Public Broadcasting Service (PBS). The logo includes a main face accompanied by two other shadows of the face encircled by a black circle. This is an example of a gestalt logo because there is closure and proximity. Closure occurs when an object is incomplete or a space is not completely enclosed. If enough of the shape is indicated, people perceive the whole by filling in the missing information. For example for the PBS logo, their is no definite outline of the face except for the gap in between the shadows. On the other hand, proximity occurs when elements are placed close together. They tend to be perceived as a group. For example, the three faces are closely together creating a unity of faces which represent people.