Fig. 1: Examples of the Face-n-Thing images with canonical upright (top) and inverted (bottom) display orientation.
From: Do subtle cultural differences sculpt face pareidolia?

When presented with upright orientation, the image on the left is one of the least resembling a face and the image on the right, one of the most resembling a face. Right panel is from9, PLoS ONE, Creative Commons Attribution License [CC BY].