Final answer:
When relatively equal-sized objects are arranged together, the viewer's eye usually settles on the middle one, as it often serves as the composition's focal point and appears balanced.
Step-by-step explanation:
Whenever an odd number of relatively equal-sized objects are placed together, your eye naturally settles on the middle one. This is because the middle object is often the focal point when arranging objects in a composition since it appears more balanced. When discussing elements of art and principles of design, the middle ground in a composition serves to anchor the viewer's gaze, which is why the eye tends to rest there. In contrast, the foreground of an artwork refers to the part of the composition that appears to be nearest to the viewer; objects here appear largest, darkest, and most detailed. Meanwhile, the background is the part of the composition that appears farthest from the viewer, where objects typically appear smallest, least intense, and least detailed.