"The attachment of the nanosites to the nerves is an aleatory 
process—we never know which nanosite will end up where. The sensations 
you are experiencing now are a way for us to take inventory, as it were. Of 
course, nothing is actually happening in your thigh or foot; it all takes place 
within the spinal column, and you would feel it even if your legs had been 
amputated."