As you see my lab above it represents showing an animation  going straight across. In this lab what i used was the foot prints of a dog going across. The elements i used was the darkness of the foot print. As you see the animation the first two foot prints use the time of 5 seconds. And as it moves on you see the difference of color the foot print lightens up and it goes back to its color. These are the elements that i used in this lab.