The Beautiful Blackboards At Quantum Physics Labs

“Blackboards, the legend goes,
were invented by a teacher. In the mid-19th century, James Pillans was
headmaster of the Royal High School in Edinburgh, Scotland. Teaching
geography, he found himself in need of a device that would allow him to
share visual information with all his students, simultaneously — a more
theatrical and efficient version of the slates students used to write
their lessons at their desks. Pillans had chalk; he had tablets. Then he
had an idea.”