I believe with the advent of acid. We discovered new ways to think and it has to do with piecing together new thoughts of mind. Why is it that people are so afraid of it? What is it about it that scares people so deeply? Because they are afraid that there is more to reality than they have ever confronted. That there are doors that they are afraid to go in and they don't want us to go in there either because if we go in, there we might learn something that they don't know. And that makes us a little out of their control.