A fiction version of these robots was described in Mr. Penumbra's 24-Hour Bookstore (http://en.wikipedia.org/wiki/Mr._Penumbra%27s_24-Hour_Bookstore http://en.w

A fiction version of these robots was described in Mr. Penumbra's 24-Hour Bookstore (http://en.wikipedia.org/wiki/Mr._Penumbra%27s_24-Hour_Bookstore http://en.wikipedia.org/wiki/Mr._Penumbra%27s_24-Hour_Bookst...), I suggest you check it out if you haven't already done so, nice, entertaining read.