Went to my dads work, and at the time our school still used punch cards and ditto machines a lot, and my dad’s work had a photocopier (WOW!) that he gave me free reign on. I photocopied a bunch of images onto transparencies , then arranged those on top of each other for some final copies. It was like building an image in Photoshop with layers, at a time when graphic art would have been 100% manual cutting an pasting of actual paper and vinyl tape spools. Pretty awesome day.