The present invention is directed to novel ketone and alcohol compounds and the use of these novel compounds in creating fragrances and scents in items such as perfumes, colognes and personal care products. The human transport device may include a platform to support a user, an enclosure coupled to the platform to surround the user, a drive subsystem to power the human transport device, and a control unit to control the movement of the human transport device in coordination with active mobile drive units moving within the workspace. The method permits generation of lens designs based on the head and eye movement of the individual and the designing of customized lenses. The cell has gas inflow and outflow ports. A second receiving groove is disposed in the second leg and forms a second pathway. The replaceable bearing surface comprises an outer housing and a low-friction, abrasion resistant button secured within the outer housing.