First, the cartoonist uses exaggeration to draw eyes insides different media, including television, computer, mobile phone and the window. Repetition technique is also used to emphasize the sense of monitor or surveillance of the US government among its citizens, which exists in every channel. Therefore, the exaggerated big eyes represent the monitor of the US government, which is inevitable of the people around the world. This makes the US government look very powerful and have high authority to collect all the information it wants.
Besides, the caricature technique can be referred to the big mouth of the man in the cartoon. The extremely big mouth and eyes symbolize that he is scared, as he is monitored closely and absolutely by the US government. He has no privacy and no choice because the door of the room is locked. All the daily necessities he used, such as television, computer and mobile phone, are equipped with surveillance system.
The speech balloons “You Can Trust Government!” are related to the technique of satire and irony. Indeed, the surveillance of the US government cannot make its citizens to believe it. Also, “You Can Trust Government!” is said by the monitoring devices, such as the computer. These elements create an ironic feeling about this monitoring action. This induces the emotional appeal of readers to agree that it sounds ridiculous!
Source: http://politicalhumor.about.com/od/politicalcartoons/ig/Political-Cartoons/Government-Is-Watching.htm