How to make objects disappear and reappear?

I was watching a YouTube video on how to make an explosion. However, the video is not very useful as the guy does not explain everything. I'm not a complete Newbie, but I still need help on simple stuf sometimes. The part that I'm stuck is when it's a "patch" of the texture in the driveway, and then it covers its explosive box. After that, he copy the box and is able to appear and disappear.

Part of the video, I do not understand is 1 minute, 22 seconds.

Here's the video link: http://www.youtube.com/watch?v=qL1KkAfwflk


Watch closely. He made a mask just below the box so that now he's just a layer which is just down the road. Then it will move this layer so that it covers the box.

This isn't a very good tutorial on how to achieve this effect. There are a lot of better ways to do what he is doing.

Tags: After Effects

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