The Rule of Odds states that we are unconsciously attracted to an odd number of shapes, objects, etc.
Our brain tends to group even-numbered objects into even groups and promptly overlooks the groups, sensing it is boring or predictable.
Example of even-numbered items in a composition.
With an odd number of items, our brain can’t quickly pair the items into an even-numbered grouping. We want to find the center or focal point so our eyes linger longer on the odd-numbered items.
Example of odd-numbered items in a composition.
In terms of composition, an odd-numbered of things is a more dynamic configuration.
Working with three objects works best. You can make five, seven, or nine objects work, but they can become cluttered if not handled carefully.