# Poggendorff illusion

> geometrical-optical illusion

**Wikidata**: [Q1542758](https://www.wikidata.org/wiki/Q1542758)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Poggendorff_illusion)  
**Source**: https://4ort.xyz/entity/poggendorff-illusion


## References

1. Freebase Data Dumps. 2013