Digital Sundial

A Sundial displaying the time inside its shadow, with actual digits ! There is a tiny bit of magic inside...No batteries, no motor, no electronics... It's all just a really super-fancy shadow show. The shape of the sundial has been mathematically designed to only let through the right sunrays at the right time/angle. This allows to display the actual time with sunlit digits inside the sundial's shadow.The sundial displays time (with actual digits !!) from 10:00 until 16:00, updating every 20 min