The PARC group first considered putting the cells on a rotating platform like a CD-ROM but nixed that because centrifugal force in rotation might pull the cells off the platter.
The great rotation everyone was looking for in late 2012 continued in January, and in full force with retail investors jumping into exchange traded funds and mutual funds.
Thankfully there is a suite of configurable parameters that can be changed on the wheel itself, things like total force feedback effect, the linearity of motion of the wheel, the number of degrees of rotation you'd like on offer (up to 900), and about a half-dozen other minutia.