on the moss' leaves, leaving cleaner air to flow back out. the idea of using moss' natural filtering properties came to the founder after he went for a jog. so, i was in shanghai and i did a lot of exercise outdoors to get back in shape, so go out for runs. and after i think two or three months, i started to have difficulties breathing and that's when i thought maybe i caught the flu, maybe i caught the cold, and it kept on lasting until the point i really left china, left shanghai and went went back to germany. and only after i came back, i realised, "hey, there's definitely a connection to the air quality in china and my personal health." that's when it clicked and i realised i have to do something about the air quality in cities. for the past eight years, green city solutions have been growing moss up to 15 times faster than in nature.