Devices, Methods, and Graphical User Interfaces for Manipulating User Interface Objects with Visual and/or Haptic Feedback

An electronic device, comprising:

• a display;
• a touch-sensitive surface;
• one or more sensors to detect intensity of contacts with the touch-sensitive surface;
• one or more processors;
• memory;
• and
• one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for:
• displaying a first user interface on the display, wherein the first user interface includes
• a background with a first appearance and
• one or more foreground objects;
• while displaying the first user interface on the display, detecting a first input by a first contact on the touch-sensitive surface while a first focus selector is at a location in the first user interface that corresponds to the background of the first user interface;
• in response to detecting the first input by the first contact, in accordance with a determination that the first contact has a characteristic intensity above a first intensity threshold, dynamically changing the appearance of the background of the first user interface without changing the appearance of the one or more foreground objects in the first user interface, wherein the dynamic change in the appearance of the background of the first user interface is based at least in part on the characteristic intensity of the first contact;
• while dynamically changing the appearance of the background of the first user interface, detecting termination of the first input by the first contact;
• and,
• in response to detecting termination of the first input by the first contact, reverting the background of the first user interface back to the first appearance of the background.

A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by an electronic device with a display, a touch-sensitive surface, and one or more sensors to detect intensity of contacts with the touch-sensitive surface cause the device to:

• display a first user interface on the display, wherein the first user interface includes
• a background with a first appearance and
• one or more foreground objects;
• while displaying the first user interface on the display, detect a first input by a first contact on the touch-sensitive surface while a first focus selector is at a location in the first user interface that corresponds to the background of the first user interface;
• in response to detecting the first input by the first contact, in accordance with a determination that the first contact has a characteristic intensity above a first intensity threshold, dynamically change the appearance of the background of the first user interface without changing the appearance of the one or more foreground objects in the first user interface, wherein the dynamic change in the appearance of the background of the first user interface is based at least in part on the characteristic intensity of the first contact;
• while dynamically changing the appearance of the background of the first user interface, detect termination of the first input by the first contact;
• and,
• in response to detecting termination of the first input by the first contact, revert the background of the first user interface back to the first appearance of the background.