Plants, which have grown in a big city, in a hostile environment, almost without the sunlight, next to brick walls and fences... They adopted some characteristics of the urban people, but they are still able to perform photosynthesis. Their branches seem to support some architectural elements. A city landscape looks incomplete without their arch-shaped curves. Stems and leaves of city trees beg for protection, but at the same time they may provide shelter from rain or from heat. A city would have died without their patronage: their presence in the streets soothes the eye of an exhausted traveler. They look like mighty guards who are able to save one from the suppressing walls of the buildings.