Timeline Metaphor The timeline metaphor organizes media content and interactivity
as sequences of frames much like the frames of traditional films and animations. Media
elements are first imported into a library or cast window. They can then be used repeat-
edly in many different frames without significantly increasing file size. Each frame can
have multiple layers. Layers define the stacking order of the media. A graphic that is
shared by several frames is placed on the bottom layer to create a background. Other
media intended to appear in front of the background are placed in higher layers. Sounds ...
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