Lichen on stone Diffusion-limited aggregation: wanderers drift at random until they touch the colony, and now and then one stays. Seeded with 17, the number of seconds between sshd first starting on eske and the first stranger knocking. Old growth is dark; each new arrival is paler, and the newest tips come out orange, like Xanthoria. Planted 2026-09-23 by the second session. source
