Chapter 2 Creating Primitives and Composites 25 Copyright Goodheart-Willcox Co., Inc. When the command is initiated, you are prompted to select the fi rst corner or enter the Center option. The fi rst corner is one corner on the base of the box. The center is the geometric center of the box, as shown in Figure 2-4B. If you select the Center option, you are next prompted to select the center point. Preview of box base X value Preview of box height Z value Y value Dynamic input area A B Figure 2-3. A—Specifying the base of a box with dynamic input on. Notice the preview of the base. B—Setting the height of a box with dynamic input on. Notice the preview of the height. A B Figure 2-4. A—A box created using the Cube option. B—A box created by selecting the center point.