# Penrose stairs

> impossible object

**Wikidata**: [Q58914](https://www.wikidata.org/wiki/Q58914)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Penrose_stairs)  
**Source**: https://4ort.xyz/entity/penrose-stairs


## References

1. Freebase Data Dumps. 2013
2. Quora