Alice Rawsthorn examines the evolution of user interfaces and interaction, from the use of references to physical objects to the current emphasis on responding to natural gestures:
The first wave of user interface designs sought to reassure us by using visual references to familiar objects to help us to operate digital ones. Take the typewriter keyboards on computers, and video game controllers modeled on TV remote control pads. As our confidence has grown, U.I. design has become more sophisticated, increasingly relating to our physical behavior, rather than objects.
The starting point on a computer is the Desktop while on the iPhone it’s the Home Screen.