Here’s a design for a split-flap clock that doesn’t do it the usual way. Instead of the flaps showing numbers , Klapklok has a bit more in common with flip-dot displays. Klapklok updates every ...

First, take a blank piece of paper, ideally A4 size that allows the person to draw freely, then ask them to draw a clock. Once they have drawn the clock face, ask them to put all the numbers in ...