From the Glass home screen, launch Preview by saying "ok glass, recognize this" and just look at a movie poster. Preview will automatically recognize the image and start the movie trailer in a few seconds. Again, everything happens automatically -- completely hands-free!
Preview can recognize most movies now playing in theaters. Also, Preview holds a lot of promise for the future, because the database can be updated remotely with support for more movies as they become available. To quickly see how it works, use the web images on the following links: RoboCop Non-Stop The Wind Rises