A Tiny Traffic Light That Actually Works - By Magic
A miniature version displays the three colours of a regular traffic light - red, amber and green.
At the magician's command, the lights change colour a number of times before it finally reverts to its original state.
This is a clever updated version of a standard effect that's been around for well over 80 years. There are adaptations of the original still in existence today, which illustrates the resilience of this effect.