A human interface configured to optimize a biomechanical effect of a human user’s opposing thumb and fingers by including, on one surface, one or more software configurable input elements manipulatable by a user’s thumb or a stylus, and, on another surface, one or more software configurable selection elements manipulatable by a user’s finger. Embodiments of the method utilizing deep reactive ion etching. Methods for improving the rigidity of the carbon structures include causing the nanofibers to form bonds or become glued with other nanofibers at the fiber intersections.