Apple has applied for a patent for an invention that changes the casing colour of electronic devices.

The device includes a housing that has “an illuminable portion”, according to Apple’s patent filing. It adds: “The computing device also includes a light emitting device disposed inside the housing. This is configured to produce a light effect that alters the ornamental appearance of the computing device.

"The light may be used to exhibit a housing behaviour that reflects the desires or moods of the user, that reflects inputs or outputs for the electronic device, or that reacts to tasks or events associated with operation of the electronic device."