Technology is increasingly an intimate part of our bodies. The PC desktop metaphor will be replaced with bodyfocused computation, the current functions of the computer, becoming an integral part of what it means to be human in the 21st Century.
Currently we accept as normal that we carry on our bodies mobile phones, USB sticks, and NFC credit cards. Some have devices implanted for medical purposes, or even for paying for drinks at a bar and Google glasses will soon make Mann-style external augmentation mainstream.
In 5–10 years external augmentation will be the norm, and in 5-15 years internal augmentation, including brain–computer interfaces will take over. The HCI challenge will be how to design these internal systems so that they seamlessly form part of our perception and cognition.