I just have to get this down before I forget it, because this is such a powerful image. I was listening to a podcast this morning (The Age of Conversation episode from The Engaging Brand) and host Anna Farmery recounted an absolutely fantastic--though brief--story from a speech by Michael Eisner. She couldn't remember the specific artist, but Eisner showed a painting to the audience (I imagine it was probably a pointillist painting). Eisner said that a brand is like this painting--when you stand back, you see a whole image (the brand). But that image is made up of myriad little points. Those points correspond to the various interactions a customer has with your brand--contact with customer service, perhaps marketing pieces they receive, the logo or packaging you use.
It's a simple thought, but so illustrative that I find it fascinating.