A useful distinction
A game can change a position in its internal state and then draw the resulting scene. The displayed image is an output of that process. Distinguishing the state from its presentation helps explain why a visual effect need not change the underlying rule.
Put it into practice
Describe one move twice: first as a change in position, then as what appears on screen. In a turn-based sketch, check that the displayed result agrees with the state you recorded. Use the distinction when explaining a bug in which the picture and the rule disagree.