The first photo is the overhead route which holds the lights. This route is directly above the audience and is a trail that goes down to present the large, heat producing lights. The purpose is this is to provide a space where if one light is broken, someone can go up there and fix it anytime without much difficulty. The lights here are not LED, therefore the heat produced by each of these lights is almost as much as how much you would get from a heater in the winter. Because they have highly complex structures, if workers have to climb up using ropes or another route, it is highly expensive and time wasting, and also the falling of the lights can cause serious damage or injury. With the help of this route, lights can fall directly onto the net instead of into the audience and to fix it all you need to do is climb some stairs and you can view, adjust, remove the lights without much difficulty.
The second location is, translated from Chinese, the “Rooftop.” This place provides support for the heavy and large curtains down in the stage. It is approximately 30 meters above audience, and its professional design, which is designed by the staff from the National Theater (国家大剧院) here in Beijing. The wooden floor is safe to step on, and the rectangular metal prisms are those that are included in the structure and provides support to the string. This place is built openly because if support or structure for the curtains break, it would be easy and time-saving to fix. 
This third location is the main stage. In the context here we watched Mr. Ma, the head of engineering in the theater transform and differentiate different curtains. There are hundred of curtains in the ISB theatre. Each set of curtains are very heavy, and would need stable support, which is shown in the second picture. Each curtain is used for different circumstances. Also, there are multiple layers as well. For instance, opening the first curtain can lead to another set of curtains inside, as shown in the picture here. 
The fourth image here are the spotlights. These spotlights are located directly above the balcony in the theatre. These lights have extremely high power, and needs 5 minutes of cool down or warm ups between closing and opining. Attached to the lid are thin plastics of different color. Moving the thin plastics can cause color change in the light. Because the fact that you are not able to close and restart the lights during a performance due to its long cool down, there are solid ones attached to the thin plastics as well to close the spotlight when needed. The handles on the other end of the light are manually operated and needs people to move the spotlight around. Also, these lights have really loud sound because of the high power voltage, so the designers located them in an isolated, closed, and quiet room on top of the audience.
The fifth picture is the right side of the backstage. Here is a dark and quiet space to operate the curtains and other utilities so that the audience will not notice it. Along with a control panel, it can also be a space to store crops during or before/after the performance. You can directly go to the stage here, which creates a passage of convenience when moving crops. It also stores chairs and stands for musical performances and choir. An interesting fact about this place is that about 20 years ago, the school invited a Feng Shui master to check this place out. The master said at the corner forwards of this picture, dark and dirty stuff are stored and no one should go near that corner. However, when we discovered this place the corner was only an ordinary place where the stands are stored. Hopefully we will not one day encounter ghosts or spirits here.
In conclusion my experience of the backstage tour was adventurous and interesting. Climbing the tall stairs were fun and difficult, whereas no covers were built in higher places for protection from falling, so we were very careful. I also managed to stand on the dangerous wooden floor in picture two, which was interesting and “unique”, whereas I was the only one standing there. Hearing those stories and discovering “secret rooms” were a fabulous experience. Here I would like to thank Mr. Ma and Ms. Hill for giving us this chance to experience and tour unknown places in the school.