As a boy, Samuel Tacchi was crazy about Lego cranes. Now he designs them, under cloak-and-dagger secrecy, at the Danish group's headquarters where Santa has filled his sacks for decades. At its ultra-modern flagship building in Billund, a visit to the offices where the design work is done is out of the question - the company is fiercely protective of its trade secrets. But Tacchi, a 34-year-old Frenchman, lifts the ...