What is the rule of three exactly? Well, it isn’t really a rule, but rather a creative guideline. It’s proven that odd numbers challenge our brains and are more interesting, as three is the easiest and smallest number that can form a pattern. Not only do you see it in interior design, but also photography, graphic art, etc. It helps you avoid too much symmetry – you need to balance both symmetry and asymmetry to achieve a great look.