> Shelves are stocked with shape and color variety in mind, and they have rigid item-placement spots. Those factors combine to make it very difficult to put stuff where Amazon doesn't want you to. Got the wrong butter? There's only one reasonable place to return the butter of your discontent.<p>I wonder if Amazon has applied this approach to their fulfillment warehouses. I imagine it'd cut down a significant amount of the overhead and help reduce the amount of "hostile workplace" complaints they've received over the years.