Also known as “common fate” since this principle is all about movement. Our eye tends to follow lines and curves naturally. Due to this, we can lead the viewers’ eye where we want. A bright color accenting motif throughout your page could lead a viewer’s eye down to your call to action (such as a sign up or buy now button).
1Old Navy uses their trademark navy blue to lead the user's eye to the add to bagbutton.

2On the Hulu website, the user follows the path down to the free trial button.
> Continue to explore the principles >