Architectural reprography is when people take really good pictures of buildings and blueprints so that they can make copies of them. It's like taking a really good photo of a picture with a camera, and then printing it out again so that you can have more copies of the same picture. This is helpful for architects and engineers who need multiple copies of building plans to share with other people or to keep for themselves. The people who take the pictures and make the copies use special equipment to make sure that everything looks clear and accurate, just like when you take a really good picture with your phone or camera.