These is one from a number of handouts a classmate and I produced for a Mechanical/Electrical/Plumbing drafting class.
We were tasked with summarizing chapters in our textbook and presenting to the class.
Most chose PowerPoint, but I wanted to avoid the monotonous and ephemeral nature of slide presentations.
I formatted and distributed the PDFs via email so our classmates could follow along (this was when classes were held online due to COVID).
This particular chapter was on lighting quality.
Documents live on, unlike slides.