System and method for balancing an input device

A system for balancing an input device, the system comprising:

• a spherical device 101 having an outer spherical wall 102 and an inner spherical wall 103
• the system being characterized in that it further comprises:
• an internal circuitry module 106 housing internal circuits and positioned in the center of the spherical device 101 and balanced in the center in order hold the spherical device 101 still on a flat surface;
• a cavity 105 formed between the outer spherical wall 102 and the inner spherical wall 103;
• a rheological fluid disposed in the cavity 105
• wherein the volume of the rheological fluid is below 50% of the volume of the cavity 105 and such that the weight of the rheological fluid is above the weight of the spherical device 101 without the rheological fluid;
• wherein at least one of the outer spherical wall 102 and the inner spherical wall 103 comprises a rheological fluid activation means 108 configured to change the state of the rheological fluid;
• and
• a rheological fluid activation controller 307 configured to control the rheological fluid activation means 108 in response to occurrence of a predefined condition so that the spherical device 101 may switch between a free rolling state and a fixed state.