You can create simple geometric shapes, lines, and arrows in Keynote when you click the Shapes button in the toolbar and choose one from the pop-up menu. You can also insert shapes by choosing Insert and selecting a shape by name from the menu, or by Control-clicking (or right-clicking) the slide canvas, choosing Insert, and picking a shape from the pop-up menu. You can adjust these shapes' borders and fills, giving them colored, gradient, or image fills. And like all other objects, you can adjust their size , opacity, rotation, and so on.
Shapes can also hold textso that they serve as differently shaped text boxes. Double-click inside a shape and the blinking insertion point appears, ready for you to type or paste in text. For the full story on working with shapes, see Section 4.2.4.