Sequential touch: A further limitation is that our system
currently uses a single electrode, covering the entire touch
surface. As a consequence, our current prototype can only
process a single touch at a time (i.e., two users cannot press
the screen simultaneously and be differentiated). It is likely,
though not tested, that a mosaic of electrodes, as seen in
some forms of projective capacitive touchscreens, could be
used to overcome this by sampling the smaller regions
which are unlikely to fit two users.