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The patent application, filed last year but published early last month, describes a number of multitouch gestures to manipulate objects, including icons, presented in a simulated 3D space. Such gestures could present users with a simplified and intuitive way to interact with increasingly complex mobile devices. "As portable electronic devices become more compact, and the number of functions performed by a given device increase, it has become a significant challenge to design a user interface that allows users to easily interact with a multifunction device," according the patent application.