Perpetual motion machine

[KaladinWorldsinger]

We know, Investiture isn't exactly energy but it can be used up. But unlike energy, investiture returns, as we learn about ruin's atim cache. 

So can we use this to create a perpetual motion machine? The time required for one cycle of the machine is equal to the time it takes for the investiture used up to turn back. We will end up getting a perpetual motion machine of the first kind

[Rg2045]

This going really nice into perpetual motion. Limitations and uses of aluminum 

[Lego Mistborn he/him]

I think there's a point where it stops being a perpetual motion machine because the machine encompasses too much(ie. The universe).