Like to try the cutting edge AR (Augmented Reality) technology? No need to buy expensive device, just install Tetragram you can play Augmented Reality with no cost.
What is Tetragram?
* It's like a magical camera, through the camera you will see a digital picture posted on a real object such as a wall or table.
* Not just see, everyone can post their own pictures to real walls, as long as there is a QR code printed on the wall.
* The picture exists permanently, you can tell friends to see it anytime on the place with Tetragram app.
How it works?
* Find a QR code on a wall and scan it with Tetragram app.
* Select a picture and post it with the place information.
* Send it to your friend, tell them to see how you hack the real world!