Great article about the pleasing use of ‘3′ items, colors, fabrics etc. when decorating and designing.
The rule of three is a guideline that can be bent. Essentially, it was put into place so that people understand that a odd-number of items is more interesting than an even-number of items. So, yes, you can arrange 5 items or 9 items into a grouping and still achieve the same visual interest.
Read more: http://freshome.com/2014/11/26/10-designs-that-incorporate-the-rule-of-three/#ixzz3KC0gxkyO
Then again there are people who absolutely love a symmetrical design layout and 2, 4, 6 will work better for their eye.