Why are we frightened when we go through the dark narrow tunnel?
What do we think when we see another person walking past?
We are frightened because we doubt each other and perceive the passerby as possible dangerous person.
I put 5 *blue signs saying Hello/ Who are you/ How are you/ Nice to meet you/ Bye on 3 unfriendly spots in New Cross Gate and named Friendly Tunnel, Friendly Park, Friendly Pathway. Actually, to question ‘Who are you?’.

* Blue means ‘must do’ as a sign.