Interpretation of a gesture on a touch sensing device

A gesture interpretation unit for manipulation of a graphical user interface, GUI, object comprising a processor configured to receive touch input data indicating touch inputs on a touch surface of a touch sensing device, the unit further comprises a computer readable storage medium storing instructions operable to cause the processor to perform operations comprising:

• determining a touch input from a user object on the touch surface, wherein the touch input has a first area a1 and a geometric centre at a first position;
• and while continuous contact of said user object with the touch surface is maintained:
• determining a change of said geometric centre to a second position;
• determining a second area a2 of the touch input when said geometric centre is in the second position;
• comparing said second area a2 with said first area a1, and if the second area a2 is larger than the first area a1:
• determining that a special gesture has been detected;
• associating the special gesture with the GUI object;
• and
• manipulating the GUI object according to a predetermined action.