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Here we see, in the Layers palette but not on the screen, a pair of invisible yellow eyebrows matched to a pair of invisible blue eyebrows. They are needed on the conehead because we will want them to transition to a pair of raised black eyebrows on a surprised face, and we want those eyebrows to fade in from blue to black rather than shrinking to black dots. Since they are visible and full size on the conehead, they can't be made to shrink down to the winking face, or they'd show up blue along the way. So they need to fade to yellow on the winking face. Only when two adjacent frames either have the same background color, as in the preceding transition where the wink developed, or we are willing to let the objects be visible and full-colored as they shrink, like the forehead freckles, can we avoid having a matching object in adjacent frames. |
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