Erm..... its a teaser for today.

 Nico71 has already built one, it’s better than an automatic transmission, it’s better than a manual transmission, but less complicated. Two differentials are the heart of this machine, but in the end, what is it? What does it do? Well those are questions that will not be answered until Friday, let your minds wander, and remember if you can dream it, you can build it.