# Hollow-Face illusion

> optical illusion

**Wikidata**: [Q1788241](https://www.wikidata.org/wiki/Q1788241)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Hollow-Face_illusion)  
**Source**: https://4ort.xyz/entity/hollow-face-illusion


## References

1. [Source](http://www.grand-illusions.com/opticalillusions/hollow_face/)
2. [Mathematics Awareness Month - April 2014 - Theme Poster. American Statistical Association](https://ww2.amstat.org/mam/2014/calendar/dragon.html)