A touchless human computer interface (HCI) provides a virtual surface in three-dimensional space and a zone of restriction for defining a level of sensitivity to movements in order to cancel noise that may be caused by natural wobble of a human appendage. The touchless HCI may receive input regarding a user movement, process the input to generate clean gesture data and analyze at least one dynamic variable to determine an interpreted action based upon a relationship of the clean gesture data with respect to the virtual surface.