National 3-D Day, celebrated annually on the third day of the third full week in March (the third month of the year!), gives enthusiasts and newcomers alike a chance to immerse themselves in the fascinating world of 3-D.

Tens of thousands of people wearing green thronged the streets across the land and around the world yesterday to celebrate our patron saint — and to drown a few shamrocks too. The national parade in Dublin saw an estimated half a million people line the route,