I have been working on A2 paper a lot and I cannot photocopy in A2 and light boxes are expensive, so I made my own. I have a very large fish tank (minus the fish obviously) that I picked up from FreeCycle, so I placed it on its side and placed a spotlight lamp inside it. Now I am able to trace larger pieces of work that I need copies of. And it works just as well as an expensive light box.
Quite a lot of students are known for running out of money very quickly and end up having to eat copious amounts of pasta. Therefore, I think that this is a great tip for university students and those who cannot afford to buy a large expensive light box. This basically cost me nothing.