I think nowadays people are so used taking the camera to the family picnic - so people are less surprised by films made of them, like home movies.

...candid still photography had taken over... What was interesting was that the photographs came without any intention of instructing you... You're like a cat looking out the window. You don't have to even know what you're watching, but you're watching it, and you're watching it very accurately.

You can't point a camera at someone and find out what's in their head. But it does the next best thing - it lets you speculate.