Onion skinning refers to a technique in time-based arts of overlaying several frames in a sequence to discern the subtle differences between them. The animator is simply looking through a stack of layers to see one whole motion through a composite of its
The drop shadow, Web 2.0's greatest asset. Well not really, but all the same they do look pretty nice, but are still a pain to implement. Who wants to go into potoshop, load your image then go through the hassle of adding the drop-shadow, etc.
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