A less wide-reaching use of reflection is when a player cuts a diagonal and then rebounds off it, thereby altering the direction of line velocity by 45-165° (typically) at a greatly reduced token cost. Note that in order to exactly reverse line velocity (180°) it is necessary to reflect off a lateral or a parallel. This manœuvre is also known as a rebound.
With care, it is also possible to reflect off a zone boundary or a line terminus. Failing to execute the latter manœuvre correctly is likely to result in serious consequences, possibly even including a derailment or worse.