A motion controlled handheld device includes a display having a viewable surface and operable to generate a current image and a gesture database maintaining a plurality of gestures. A first conductive plate located on the first surface comprises a first conductive region couplable to ground by a shorting element, and a second conductive region. The case member forms an interior in which is disposed the cartridge member with multiple cartridges each containing one of the marking substances and a tip through which the marking substance is applied. The index advisor then makes an index recommendation based on the index importance. These features of the invention provide a handpiece where the nozzle can be quickly released or disconnected from, and reconnected to, the handle, thus providing facile exchange of nozzles of varying shapes and sizes, as needed to accomplish the a desired task. The base may extend between at least two end regions.