The devices listed under each stage represent the devices that could be utilized in that stage. For example, we need a camera to capture the scene, we use a scanner to digitize a hardcopy image, or we draw an illustration on a computer. There are different devices associated with each stage, but there is one device that is in common for all three stages. And I believe you already know which device we’re talking about. Yes, it is the monitor. Why is this the only device that occurs in all three stages? Because nowadays almost 99.5% of the artwork or images are in digital form, and unfortunately, we still don’t have the technology to allow humans to view digital content directly, such as by plugging an SD card into our brain. We still need a display device to enjoy digital content, and the most often used device is by far the monitor. Of course, one could argue that a projector could also be used, but we don’t have the luxury to have a large, undecorated wall and dark surroundings with us at all times. Hence, one could consider the monitor as the most important tool used in the color management workflow.