Day 53. Pound symbol, number sign Earth Day. Cast in 8pt Cairo Light and Bold, Bold cast from the same mats in the upper position (on the rails). For further reading:

https://twitter.com/ilhan/status/1120380707463938048?s=21

https://www.google.com/amp/s/amp.theguardian.com/environment/2018/oct/08/global-warming-must-not-exceed-15c-warns-landmark-un-report

https://medium.com/designscience/1970-ad0c58b5a9dc