As German publishing tycoon Axel Springer laid the foundation stone for his eponymous company’s headquarters in occupied Berlin in 1959, his ideology was also committed to the earth. A deed accompanying the stone, signed by Berlin mayor Willy Brandt, read: “For the free word in a free and reunified Germany with its capital city Berlin.” When the Berlin Wall went up two years later, just 12 metres away, the headquarters served as an imposing visual reminder of the principles of freedom underpinning one of Germany’s largest media groups, which was founded in the rubble of Hamburg following the end of...