| CPC G02B 6/2555 (2013.01) [F16M 11/041 (2013.01); F16M 11/12 (2013.01); F16M 11/18 (2013.01); F16M 11/32 (2013.01); G02B 6/2553 (2013.01); G02B 6/3616 (2013.01)] | 20 Claims |

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1. A method of positioning, comprising:
providing a structure, at least one base, and a plurality of actuators configured to support the structure over the at least one base and to move the structure relative to the at least one base in response to extension or retraction of one or more actuators; and
throughout movement of the structure, three or more of the actuators maintaining contact with the structure through a joint having at least four degrees of freedom (DOF).
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