A six-degree-of-freedom travelling system, wherein a solid is driven by eight suspending lines in six degrees of freedom. The six-degree-of-freedom travelling system can be provided as a bodily sensing machine comprising a human-riding cage: eight suspending lines in connection with the cage; eight actuators hauling and veering the respective lines for vary the position and attitude of the cage, and a controller controlling the eight actuators for constantly holding the eight lines under proper tensions, wherein the cage is travelled in six degrees of freedom.