"It is relatively simple and can be done quickly. The only part that slows you down is setting the colors. The Fade in technique is explained below. You can apply the same and reverse the color scheme to attain the Fade out effect."
Create multiple copies of an object. You can Copy the object and then use Ctrl+V to Paste it multiple times.
Change the color or shade each time the object is pasted, or using the Tab key, go through the objects and format each with a different degree of color.
Next select all the objects. Drag the mouse around the collection of objects.
With the objects selected, use the Align or Distribute option on the Drawing toolbar to Align Middle . You may also have to use Align Center .
The objects will be perfectly aligned, one on top of the other.
With the objects still selected set the animation to Appear 0 seconds After Previous event. You may have to change the timing to 0.1 seconds.