We don't have some magic sensor that tells us how far away an object is -- it's all gleaned from the light, and distorting the angles, in particular, will throw

We don't have some magic sensor that tells us how far away an object is -- it's all gleaned from the light, and distorting the angles, in particular, will throw off this perception of distance. It would be nice to see a write up of exactly what effects they considered, though.