Anyone who worked an office job during the 1990s is probably very familiar with motivational posters. Each featured a photo of scenery or of someone succeeding at a challenging activity (such as rock climbing or hang gliding), and below it a black background with some pithy quote. During that decade, it was impossible to walk into a corporate workplace without spotting at least one of those posters hanging next to the watercooler or gracing the HR director’s door.