You can calculate lots of interesting things about a face based on this. Including generating a face that people will remember very well because of unique features or one that is hard to recognize.
The optimizations our minds have found for such complex tasks are amazing.
That looks like CNN algorithm right?
Paper: http://www.cell.com/cell/fulltext/S0092-8674(17)30538-X
"Facial images can be linearly reconstructed using responses of ∼200 face cells."