The clock is a very common fixture in our daily lives, but the way it displays time can be very special. This whiteboard clock (Plotclock) designed by joo, a foreign expert, is very creative. It works like a miniature plotter. Two mechanical arms can hold a blue pen and write the current time on a small whiteboard. After writing, erase it and write again, and the cycle continues. , the time interval written down each time is one minute, which is accurate to the minute.