By 1984 Lego blocks were being sold in more than 120 countries, and were being described as probably the world's most widely known toy.

Once again, he is trying to rebuild the Lego blocks of security in his mind.

You just get a Lego block that says, "Sorry, can't display Flash."

Lego blocks are joined together by studs on the top, and holes in the bottom of the brick commonly known as the stud-and-tube connection.

One trick the robots cannot perform is gathering up stray Lego blocks and putting themselves away once play is over.

"Lego blocks are too late for my collection," he said.

One day, the couple borrowed the Lego blocks of their two-year-old son and began to play, too, with ideas for their dream house.

The robots, assembled in much the same way as the classic Lego blocks, move, chirp and obey electronic commands.

In Europe, though, 80 to 85 percent of homes have Lego blocks.

The traditional date for the first Lego blocks is 1947, and the toys have continued to be produced with little interruption since around that time.