By the 60s, technology had transformed hugely. The first portable camera was invented and filmmakers were able to record real life. Before, synchronized technologies were limited and filming had to be done in studios, but now it became possible to follow people, shoot amongst crowds or just observe. The genre of documentary became very dominant.
Here are a few films that were revolutionary at the time:
Marc Isaacs lectured at my university this week. Here is his short film 'Lift' which portrays interesting observations. I enjoyed it as we gradually got to know the characters more each time they entered the lift. Some scenarios are also rather comical.