Facinating, thanks for sharing Diego. My window looks out on a 100yo clay tiled roof maybe 6ft from gutter to ridge, lichens proliferate across the whole roof, but mosses only grow on the bottom ~3ft, which leads me to think lichens play an underapreciated role in ecological succession, I watch birds digging in the mosses for invertibrates, and I take ~1" of soil out of the gutter every couple of years, often with grasses already rooted in the gutters.