Regarding the foil reference, it’s actually a reference to something that technology has made obsolete. Back then people used to use overhead projectors for presentations, and the sheets of transparent film were called foils. There were sometimes hand drawn with markers, people could have used LisaDraw to print foils. Later on programs like Aldus Persuasion and Microsoft PowerPoint were used, but for a long time their output was printed rather than used directly like most people know today.