[genericlogic]

I find it interesting that if you flip the image around it looks like it's 'sticking out'.

[oon]

I wanted to comment exactly this. The hollow face illusion

https://en.m.wikipedia.org/wiki/Hollow-Face_illusion?wprov=s...

[thedirt0115]

And interestingly, not everyone sees the illusion: https://www.ncbi.nlm.nih.gov/pubmed/27847925