A herd of elephants thunders towards you. you fall to the ground. their huge feet strike the earth all around you. no,it's not a nightmare or a safari gone wrong. it's a three-dimensional movie, coming to an IMAX theater near you. movies in three-dimensional(3-D) are not a new idea. they were popular in the 1950s. back then,the audience wore special glasses to make the movie pop off the screen. one lens was blue and the other lens was red. today,new technology makes 3-D movie effects amazingly real. here are some of the features that make IMAX awesome. special film. an IMAX film strip is 10 times larger than regular film. the larger the film,the better the of the quality of the picture on the screen. the screen. the IMAX screen is as tall as an S-story building! it is 80 feet high and 100 feet wide. A regular movie screen is usually about half that size. Double lenses. a regular movie projector has only one lens. The 3-D movie projector has two lenses. Each lens projector a slightly different image on the screen. to watch an IMAX movie,you need to wear a special headset.