Question: How many lights are displayed at the event?
About the article "Disney's Hollywood Studios", section "Annual events".

Candidate passages:
Many of the pictures displayed are dated, and at the very least over 12 years old. 
The hands on experience at Safetyville includes pushing buttons, and learning to look both ways before crossing the street while using the working street lights and crosswalk lights.
Before watching a video at the "fire station" the tour guide engages the children by asking questions and there is a "quiz" after the video.
There are many opportunities for questions and answers and for children volunteers to help throughout the tour.
Additionally, the children are taught how to make a real 911 call, and they practice dialing the correct number and how they would talk to a 911 operator.
They are taught how to "stop, drop, and roll" during the fire safety portion of the session, and they practice the technique on the spot. 
The simplest form of lighting is a steadily burning lamp.
These may be white lights used on scene to enable emergency workers to see what they are doing, or they may be colored lights that advertise the emergency vehicle's presence.
In the latter case, steadily burning lights are often used alongside rotating or flashing lights rather than on their own, though historically some emergency vehicles only displayed steadily burning lights.
For example, California Vehicle Code Section 25252 states that: "Every authorized emergency vehicle shall be equipped with at least one steady burning red warning lamp visible from at least 1,000 feet to the front of the vehicle" 
Light originating from a small volume, an enclosed space lighting objects within that space.
Shading is interpolated based on how the angle of these light sources reach the objects within a scene.
Of course, these light sources can be and often are combined in a scene.
The renderer then interpolates how these lights must be combined, and produces a 2d image to be displayed on the screen accordingly. 
 The Big-O Show: The Big-O show is the main performance on water and it is one of the must-watch performances in Yeosu Expo 2012.
The show is not performed by people but rather by a gigantic donut-shaped machine that is capable of igniting explosive fires, spraying seawater, and shining lights of different colors at many directions.
The machine is 120 meters wide and has 345 water nozzles.
In addition, there are numerous small water fountains at the bottom that shoot the seawater upwards to more than 70 meters.
The hollow circle in the middle of the machine is used to display the animated video.
Instead of using a projector with a screen, the machine uses holograms generated by the machine and water falling from top of the machine as the screen.
Special effects such as the lights, water, and fire are displayed accordingly to the mood of the video.
The plot of the video involves a female protagonist who explores the sea.
The main theme is peace, cooperation, and hope, and the video attempts to explain how sea is the origin of all life, how humans are polluting it for their own benefits, and what people can do in order to conserve it.
Big-O show is held only once in the evening from Sunday to Thursday and held two times at evening from Friday to Saturday.
Because it is held only few times and it is such an important and beautiful show, there are always an enormous amount of people waiting to see it.
There are multiple security measures as well because there aren't enough seats to occupy all the audiences.