Punch card. Keyboard. Mouse. Touchscreen. Voice. Gesture.
This abbreviated history of human-computer interaction follows a clear trajectory of improvement, where each mode of communication with technology is demonstrably easier to use than the last. We are now entering an era of natural computing, where our interaction with technology becomes more like a conversation, effortless and ordinary, and less like a chore, clunky and difficult. Those of us working in the field are focused on teaching computers to understand and adapt to the most natural human actions, instead of forcing people to learn to understand and adapt to technology.