History is brought to life in this video. A marker is used for the digital camera to recognize the code and then show the corresponding content overlaid on the camera image. In this case, a three dimensional Abraham Lincoln is delivering the Gettysburg Address.

http://www.youtube.com/watch?v=zyGc5JWJpPs&feature=related

Historical images can overlay reality so users can see how the building or area once looked years ago.

http://www.youtube.com/watch?v=iB3BwvHdJiI

Augmented reality can be used in architecture. The printed marker in this video provides a three dimensional view of a two story house. It has been programmed such that with an additional keystroke, the inside of the house is viewable by first removing the roof and then the second story.

http://www.youtube.com/watch?v=ffWZl7tC9i8&feature=related

Math concepts are being illustrated using marked cards, called paddles in this video. In one example, moving the paddle cards closer together makes the diameter of a sphere decrease. Simultaneously, the student can see how the diameter, surface area, and volume change proportionately.

http://www.youtube.com/watch?v=JKn7W8uAt3k&feature=related

Central Park in New York City added QR Codes throughout the park so visitors could further enjoy the park in new ways such as providing a movie clip of an orchestra playing in the amphitheater when there is none there in reality or providing geologic information on a rock the visitor is standing on.

http://www.youtube.com/watch?v=7OCyfV_k2_g

Real time procedural information, both visual and audible, can be provided to aid, for example, an auto mechanic. Although not stated, it is believed that the goggles worn by the mechanic are using visual image recognition to detect and properly overlay the content information.

http://www.youtube.com/watch?v=P9KPJlA5yds&feature=related

Augmented reality can also interact with the physical world according to the laws of physics as shown in this video. The car in the video is the augmented reality while the table top and molded hills are real. Note that a physics programming engine is required for this capability.

http://www.youtube.com/watch?v=X2DYCjvEw5A&playnext=1&list=PL9C0AD0B4B78896E4

Follow this link to review a Handheld Augmented Reality Project (HARP). The PowerPoint presentation provides an interesting explanation of how augmented reality is being used for under-served middle school students. Students role play different characters in small groups to collaboratively solve a problem relying on content that is provided based on their GPS location. The available video allows you to see it in action.

http://isites.harvard.edu/icb/icb.do?keyword=harp