These are not just bookends, but also officially licensed Portal collectibles. It is the perfect match of functionality with imaginative visual appeal. You see a subject already halfway-in through the orange portal on the left, and the other half exiting out of the blue portal on the right. The bookends are made of shiny and durable aluminum, so you and generations of geeks to come will be enjoying the books and the collectible bookends. The soft rubber at the bottom ensures it won’t slip or slide.