A description by Eliezer S. Yudkowsky as what he sees are the various Shock levels of possible future technology. He describes it as a way to measure what concepts people are comfortable with, and after determining that, what concepts they can be introduced to without running into a point where they become frightened of the ideas. The basic idea is that it's safe to introduce someone to ideas that are one level above where they're familiar.

To determine your level, consider the ideas presented in each group. If they seem inevitable, and give you no real worries about their development, then you've accepted that level. When you start considering the topics, and run into a strong, almost blind excitement, or strong "I don't want that to happen" fear, then that's above your current threshold.