Every body has their own subjects to think off. One of mine is the interaction between people and their environment in the cities. Special how they introduce nature in an urban environment. I don't mean the organized nature but that what's added by the individuals. In some old areas of Amsterdam it's quite strong, in cities as Paris you hardly see it.
A so called "geveltuin", "wall garden".
If this subject is liked I'll post more examples. It's going to be hard to produce different images after a while.
George