The original Lego brick turns 50 at exactly 1:58 p.m. today and celebrations are taking place in playrooms and classrooms around the world.

On average, there are about 63 Lego bricks for every one of the world’s inhabitants. And to celebrate the 50th birthday of the brick, the Lego Group has developed two commemorative products; it’s also announcing programs and activities through the entire year to engage families and children in the celebration. (To get a taste, check out the homepage of google.com today.) Among the plans is a global building challenge inviting children from around the world to become the best Lego builder in their country.

Each winner will then meet in Billund, Denmark, home of the Lego Group, to compete in the ultimate building event.

Details about the contest will be unveiled on www.Lego.com/club in March.