.. toctree::
   :maxdepth: 1

   Leaving a Trail <trail>
   Attach Arrow <attacharrow>
   Attach Light <attach_light>

• An object can leave a trail behind it as it moves.

A binary star system, showing two different types of trail.

• An arrow representing a vector quantity can be attached to an object, automatically updating as the object moves.

The arrow represents the instantaneous velocity of the bouncing ball.

• To make a moving light, a light can also be attached to an object.