Let me paint you a picture..
In most Dutch cities you have roads that are not tar-sealed but are made out of cobble stone. Creating such a road is a tedious job, involving you going down on all fours and putting each and every brick down by hand. Apart from overexposed builders crack it is also very bad for the back and knees. Hence that the Dutch seem to be more than willing to have immigrants from countries like Poland do the job for them..
But now a clever Dutchie has deviced a machine that only requires you to insert the bricks into a slot at the correct order without having to hunch over and out the bottom end comes a fully assembled brick road. Howzat!!??
See it in action here:
Order your one here.