A color well is the small color box you click to open the Mac OS X Colors window to choose
a new color for the selected object. The color well has two parts: a color swatch that
displays the currently applied color and a downward arrow.
To change the color of an object using a color well
Click the swatch, then pick a color from the Mac OS X Colors window. For more information,
The Colors Window
Click the color well’s downward arrow or control-click the color well, then pick a color
from the Motion pop-up color palette.
Click the eyedropper, then click an object of the desired color in the Canvas.
User Interface Controls
Click the disclosure triangle on the left side of the color controls to expose individual Red,
Green, Blue, and, when applicable, Opacity sliders.