A year or two ago, a colleague of mine discovered what appeared to be a brand-new laptop bag stuffed in a corner of the office. He opened it up and was somewhat baffled by what he found. It was a portable OHP.
If you are anywhere near as old as me1, you will know what that is. An overhead projector. This was essentially a light bulb in a box with a lens attached. It would project whatever was written or printed on a piece of transparent plastic, known as an acetate,2 onto a whiteboard, a wall, or a screen. Once commonplace, these have been consigned to the same place as VHS videos, Banda machines, and televisions on a trolley. What killed the OHP was the spread of digital projectors and interactive whiteboards.
Before long, teachers were spending their weekends making PowerPoints for their lessons. School departments would attempt to create slide decks for their entire curriculum that “anyone could use”. Multi-academy trusts produced branding that teachers were required to paste into every PowerPoint.
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