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Were jumping the gun a little here by talking about movement before we have created any entry point for the eye (you wouldnt dance with a stranger unless invited), but this sequence works better for the feeling approach to learning about design.
There are many ways to create movement in the picture plane, and one of them is using the fact that the eye wants to move from dark to light. It also likes to travel from left to right and can even be bounced off objects like a tennis ball in whichever direction we choose, but for now, this simple dark to light preference will suffice to illustrate the point.
You can feel it for yourself by glancing quickly at the two picture planes to the left (Remember to include only what is inside the borders - not the type underneath.) In A, your eye moves from top to bottom, and in B, from upper left to lower right - - following the light. Simple, but such a powerful tool to have at our disposal.
By the way, exactly where did your eye enter those two picture planes? Is it harder to tell on A than on B? That is because the darkest corner in B actually creates a rudimentary point of entry (focal point).
While were at it, where did your eye exit? Most probably, somewhere out the bottom of A, and out the bottom right corner of B. Why? It is led there by the light and theres nothing to stop its travel.
How long did it stay within the picture frame? Not long, right? Just a slide through?
Now, take a look at Picture Plane C. Whats the difference between it and B? Your eye didnt get to slide out that bottom right corner so fast, did it? It hung around a little longer when it ran into the darker corner, and then exited either to the Northeast or Southwest - again, following the light. Most likely, it exited Northeast because the eye also likes to move left to right.
Hopefully, you are starting to get the feeling of movement in the picture plane. This understanding is critical to good design.
When you look at Picture Plane D, you can feel a difference in the experience. Your eye is still following the light, but the lightest spot is in the center of the plane and there is no obvious exit. The eye is held within the picture plane longer.
This brings us very close to the center of interest concept, otherwise known as the focal point. The focal point is determined by emphasizing it in some way to make it stand out from everything else in the picture plane. In this simplest example, the center of Plane D is lighter than anything else around it. It catches, and holds the eye.
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