Final Cut Pro - The Twirling Thingy of Color

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Nothing is more frightening than an unknown Thingy. Read this to defend yourself.

Nobody ever asks me what this twirly button does -- which is a shame, because I actually know.

Between the color sampling eyedropper and the color chip is a weird curvy-arrow button that does absolutely nothing, until you start using keyframes to change the color of something -- such as text.

This twirly thingy determines the direction of color rotation as you move from one keyframe to another. For instance, if the thingy points clockwise, the colors rotate from green to red to blue and back to green. If the thingy points counterclockwise, the colors rotate in the opposite direction, from green to blue to red and back to green.

Cool.