As construction commenced in 1968 on the largest building project since the pyramids, questions and controversies swirled around Lower Manhattan. How tall? Why two? What’s a slurry wall? A kangaroo crane? Where are the small businesses going to go? What’s a world trade center and who needs it anyway? Guy Tozzoli, the Port Authority visionary behind the building of the Twin Towers, had an inspiration—”Construction Guides.” Friendly co-eds in mini-skirt uniforms were posted at corner kiosks on the site to inform an inquiring public and put a pretty face on a controversial issue.