The same happens if you double click on any clip that's been inserted into the construction window. In this case, we've done this for the first clip of the movie we're going to build: here the camera tilts down from puffy, summer clouds to the scientists' van.
In Premiere and in all its rival software products, the construction window constitutes the space in which you assemble your clips along a timeline. By changing the units of time along the timeline, you can expand or collapse it according to the level of detail you want to see as you put together your movie.
Here we've inserted four clips into the construction window. Let's take a look at the movie we've built so far. In Premiere, you can preview movies in the construction window in several ways. You first need to define the part of the movie in the construction window that you want to check, using the yellow bar at the top. Then, hit return or click on the right arrow button in the top right of the construction window. The computer compiles the movie, which normally takes a few seconds, after which a preview window is launched. You're all set to preview the movie.