Graphical objects that respond to touch or motion input

A method performed by one or more processors, comprising:

• presenting a user interface on a display of a device;
• displaying an object on the user interface, the object representing a file having an age;
• and
• adjusting the visual appearance of the object on the user interface based on the age of the file.

A system comprising:

• one or more processors;
• a computer-readable medium coupled to the one or more processors and storing instructions, which, when executed by the one or more processors, cause the one or more processors to perform operations, comprising:
• presenting a user interface on a display of the system;
• displaying graphical objects representing files on the user interface;
• receiving a request to sort the graphical objects based on the relative sizes of the files the graphical objects represent;
• and
• responsive to the request, arranging the graphical objects in a hierarchy on the user interface according to the relative sizes of the files the graphical objects represent, where the arranging includes animating the graphical objects in the user interface so that each object appears to have a mass that responds to real world, physical forces.

A system comprising:

• one or more processors;
• a computer-readable medium coupled to the one or more processors and storing instructions, which, when executed by the one or more processors, cause the one or more processors to perform operations, comprising:
• presenting a user interface on a display of the system;
• displaying an object on the user interface, the object representing a file having an age;
• and
• adjusting the visual appearance of the object on the user interface based on the age of the file.