Tim Noyce Advies

Birmingham University in the UK used to have something called a “lecture cube” for gauging the speed or uptake of a lecture. It was red on two sides, white on two more and green on the remaining two.

Depending on how the students placed them on their desks, the lecturer would see a field of colour in the audience that would let him know if he was too fast/obscure (red) or too slow (white). Green meant just right…

This sounds like a device that would be useful in big meetings. Looking around the room and seeing a lot of red would mean you have wandered off topic.