Overhead projectors... yes I definitely remember. Used to lug a sports bag heavy with binders of the OH slides around the country, while lecturing an intra-company course on a certain inhouse programming tool. Literally back-breaking, and the arrival of the now-common laptop+powerpoint+projector combo felt like salvation...

On the other hand, I liked the hands-on feeling of the OH slides. Making annotation or adding emphasis during the lecture felt easier with them. They sort of acquired character with use.

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Back in the day there was a gadget called an OHP, OverHead Projector where one put those transparent plastic sheets and several hundred people in the auditorium could share what one had written.

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