Das Nasse Dreieck (The Wet Triangle) - formerly part of Berlin Wall death strip - is a rather hidden green space bounded on two sides by busy rail lines and and on the third by well fenced allotments. The entrance is tucked away out of easy sight and one gets the feeling that only locals know it. Kids play here after school - there is a great climbing tree -  otherwise it is a dog walking domain. As the name suggests the ground is pretty soggy, pools form at the slightest suspicion of rain and footsteps squelch. Clumps of low trees and thorny bushes are home for chattering sparrows, crows, magpies. Trains sing or rumble past, distant building sites and bells sound from afar. Over time the presence of close birds, sub base freight trains and the distant city gives every possible mix from urban soups to transparent spatial perspectives.