MoInstance
This page covers the MoInstance object in Cinema 4D's MoGraph system. It generates instances of an animated object's past states — onion-skin-like motion trails that behave as clones and respond to every Effector.
An animated MoInstance object can look into its past for an adjustable time (measured in frames of the animation) and generate these states as instances. These instances in turn are normal clones that work with all effectors (the Step effector is particularly useful here).
In the following scene, a Cube was cloned and animated in a radial Cloner. A MoInstance object generates instances from the temporal Cube states, which are scaled by a Step effector. In addition, a Tracer object acts and creates splines from the cube trajectories:

