The Rule of Odds in art runs along the lines of “whatever odd thing you do, people will put it down to your being arty”.
No, wait, that’s the Rule of Oddbods.
The Rule of Odds in art is that a composition will be more dynamic if there’s an odd number of elements in the composition, say three or seven, rather than an even number, say two or six. The reasoning is that having an odd number means your brain can’t pair them up or group them as easily, that there’s somehow always one thing left over, which keeps your eyes moving across the composition.
Why do we pair things up naturally? Perhaps it’s because our body is designed in pairs: two eyes, two ears, two hands, two feet, and so on. (Okay, only one nose, but it’s got two nostrils!) Whether we’re painting apples, apple trees, or apple-eating creatures (aka still-life, landscape, or figures), the same Rule of Odds applies.
Take a look at the brushes in the jar in these two versions of a painting.
If I asked you to count the brushes in the left-hand photo, you’d likely be able to do so quickly — once glance and you’ve taken it all in. Whereas in the right-hand version you’d have to spend a little more time and you may, ultimately, be uncertain because some brushes are hidden behind others — you’re spending longer looking and engaging with the composition.
It’s the Rule of Odds in action. That I painted this scene at all, well that’s the Rule of Oddbods.