> Equally, you can design something in A4 size on the computer, then print it on A3 paper without any changes. Then send it to the print shop for an A1 print, s

> Equally, you can design something in A4 size on the computer, then print it on A3 paper without any changes. Then send it to the print shop for an A1 print, still with no changes. My equivalent experience in academia is that you can design posters and print drafts on A4 sheets to see how they look and be confident that they won't be butchered when put on A0 at the print shop.