It's in the Video Projector room

You might also have noticed that one of the videos that kind of looks like this shape. But not quite.

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You might notice that when you're behind the screen, some of the picture bleeds through, and gets a little distorted.

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Start the third video. Fast forward to a point near its ending.

(You can save time by fast forwarding and rewinding through the video using the panel where you first drew the path to start the video.)

It will be pretty clear when you see the part that looks like this symbol. A (white) circle toward the top of the screen. Cue the video up to just before that moment, then walk around the back of the screen.

On the back of the video screen, you will see a clear path to trace.

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Try watching the third video from the left. (The black and white film.)

This one is underground.

Have you ever walked around the whole room during a video?