By combining the spacing is speed, and toggle animation concepts, you can make this motor boat appear to move fast by creating a parallax effect. Parallax is the word used to describe the illusion of the foreground moving by really fast while the main thing, in this case the boat, stays still in the middle of the screen.
Why Is This Important?
Understanding parallax requires the animator to think and plan from a point of view. Parallax is a way to focus the audiences attention on the main object or character in scenes with chases or rapidly moving backgrounds and foregrounds. It also requires the three basic animation concepts of looping, spacing for speed, and toggling to be applied simultaneously.
