Apparatus comprising a flexible sheet with a hollow chamber

An apparatus comprising:

• a flexible sheet having a hollow chamber disposed within a thickness of the flexible sheet at a localised region of the flexible sheet, and an opening for transfer of a fluid between an exterior of the flexible sheet and the hollow chamber;
• a fluid source configured to supply a fluid to the hollow chamber via the opening to cause an increase in at least one of the surface area or the volume of the flexible sheet at the localised region;
• and
• a control circuit for controlling the fluid source, the control circuit configured to identify a category of movement of a user as movement of the user is occurring, to predict a required change in pressure in the hollow chamber responsive to the identified category of movement and responsive to previously logged data associated with previous control actions carried out by the control circuit in controlling the fluid source, and to pre-emptively adjust the supply of fluid to or from the hollow chamber responsive to the predicted required change in pressure, wherein the fluid is a gas, and the fluid source comprises a compressed gas canister configured to dispense the gas, wherein the control circuit comprises at least one electronic sensor, wherein the control circuit is further configured to pre-emptively adjust the fluid based on current feedback from the at least one sensor and independently of an input command from the user, wherein the logged data comprises previous feedback supplied by the at least one sensor during the previous control operations, the logged data stored in a memory of the control circuit.