Everything radiates. Whether it’s a car door, a pair of shoes or the cover of a book, anything hotter than absolute zero (i.e., pretty much everything) is constantly shedding radiation in the form of photons, the quantum particles of light.
![](https://3c1703fe8d.site.internapcdn.net/newman/csz/news/tmb/2019/corkscrewpho.jpg)
Source:
https://phys.org/news/2019-08-corkscrew-photons-spontaneous.html