That last device of course is still in use, though usually injection-moulded and with a webcam attached, rather than hammerited steel with glass optics. Architect Ted Cullinan is a master of the medium, enchanting audiences with freehand pen sketches to illustrate anecdotes from 50 years of practice. I last saw him at a sustainability seminar at Bluecoat in Liverpool last year.
As a technique it seems to have a closer relation to speech than powerpoint which often seems like a publication of some kind, and therefore more fixed. As a result, it leads to a sense of storytelling rather than a show - which is sometimes just what an audience needs. I will to give it another try at the first opportunity.
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