The conscious falling out of the human horizon.  

 https://mobile.nytimes.com/2017/07/14/world/asia/china-liu-xiaobo-nobel.html

 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1803463/pdf/annsurg01382-0108.pdf

https://mcachicago.org/Stories/Blog/2017/04/Working-For-The-Toward

 “The difference between past and future only exists when there is heat." Carlos Revelli 

Glass, steel