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Does anyone know how to create a ghost trail effect? For a simple example look at this screenshot:

You can find the actual animation here. What I would ultimately like to see it happen is to make the object move based on whatever equations you specify it. For instance, to make it move around a circle the object should have the position (cos[t], sin[t]) . Or, lets say you have a list of specified coordinates {(x1,y1), (x2,y2), ..., (xn,yn)} , All I want to be able to see is the trace as an object takes in the coordinates I specify.

Here is a simple ball moving without the ghosting effect.