It's interesting that culture has an influence on this labour-saving feature of the brain, making it a blend of nature and nurture: that's a rabbit in the moon, not a dark face. Billions of Chinese would agree.

Also, a tour guide in Al Hoota cave in Oman points out the name of god written in Arabic in the walls of the karst, and also Jeita grotto in Lebanon. The same motif turns up frequently in tomatoes and cucumbers in the middle east too, but would go unnoticed in most kitchens round the world.

Also, interesting to consider the extent to which we can unlearn patterns or reprogram ourselves ("we must unlearn the constellations to see the stars" - Jack Gilbert), and how the brain deals with choices of interpretation (e.g. the rabbit-duck illusion).

A very rich seam, nicely presented. Thank you.