3-D charts are commonly used to illustrate volume. In order to make the various three-dimensional elements stand out, you may want to tilt the plot area or rotate it. Here's how you do that:
Choose Corners from the Chart Objects drop-down list on the Chart toolbar.
Drag the corner to change the 3-D perspective of the plot area. A wire frame follows the mouse pointer to show you approximately how your chart will look in that perspective.
When you like the perspective, release the mouse button. Excel redraws your 3-D chart to match the perspective you choose.