Everyone has been talking about it… But what is it?
HQ has named it so, it is the effort to create full 3D models of all types of neurons in the ganglion layer of the mouse retina sample dataset we’re tracing in eyewire. 200 (I think) cells were chosen with a countdown as cells were completed. 200 199 198 etc.
After this ends we get some more bonus cells and then (I think) a new dataset. 
We choose to reconstruct all 245 cells within a specific area of the ganglion layer. After the Countdown to Neuropia, we will be continuing with bonus cells.
To read more about our goals with Countdown of Neuropia check out this blog post.
One might say that Neuropia is not a place, but a state of… mind.
