If you’re looking for a way to dwindle ten minutes - or maybe even ten hours - from your life, then try drawing the perfect freehand circle on a touchscreen device and let this wonderful little ...

The Pope hoped to hire a fresco artist and sent to Giotto a messenger, who asked for a competitive sample drawing. With just paper and a pen, Giotto flicked his wrist and drew a perfect circle.

Put the compass spike at the bottom of the circle and draw an arc that touches the top of the circle and extends more than half way down each side... Image caption, ...then keeping the compass ...