They say three is a collection. Building on that, we think 5, 7, 9, and so on are also good for displays. But we've always shied away from arranging even-numbered groupings...Whether flowers in a vase or frames on a wall, odd numbers seem preferable to even. We think it's something about creating a happy randomness. Your eyes automatically want to split in half most even-numbered arrangements. But given 5 or 7 of something provides an integrated mix that isn't easily split. Is this just our own tendencies or do you share this opinion?