User Control · Throughout iOS, people—not apps—are in control. An app can suggest a course of action or warn about dangerous consequences, but it’s usually a mistake for the app to take over the decision-making. The best apps find the correct balance between enabling users and avoiding unwanted outcomes.
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Depth · Distinct visual layers and realistic motion convey hierarchy, impart vitality, and facilitate understanding. Touch and discoverability heighten delight and enable access to functionality and additional content without losing context. Transitions provide a sense of depth as you navigate through content.
Direct Manipulation · The direct manipulation of onscreen content engages people and facilitates understanding. Users experience direct manipulation when they rotate the device or use gestures to affect onscreen content. Through direct manipulation, they can see the immediate, visible results of their actions.
Many of the benefits from keeping terrorism fear levels high are obvious. Private corporations suck up massive amounts of Homeland Security cash as long as that fear persists, while government officials in the National Security and Surveillance State can claim unlimited powers and operate with unlimited secrecy and no accountability.
With spectacular events taking up so much of the available anxiety quotient, we need to be constantly reminded of the more workaday threats to our mortality - threats that, while they may also be functions of human error, have become so ubiquitous that we've begun to apprehend them as natural phenomena.