Just messing around with SAI. One day I will unlock its secrets.
Anyway I had an idea where these people have these sort of bio-mechanical tails. The tail plugs into the end of the spinal cord, and so it's kind of like an extension cord for the nervous system. Then the end of the tail can be plugged into a mecha or a space ship or whatever - and basically whatever machine they're controlling becomes an extension of their own body. Each machine has a nervous system so to speak.
WEH NERD THOUGHTS