This is a cross-section of a Lego brick mold. First, very hot plastic is injected into the mold on the right side. It then spreads through little channels and is then pushed into the press area of the mold through very small slits. When cold water is then flushed through the mold, it cools down the plastic, and the mold opens, allowing the bricks to snap off and drop down onto a belt below.
Please visit the Road Trip 2011 page for all the coverage from CNET reporter Daniel Terdiman's travels through Europe.