The balcony probably wanted to be deeper, but the alley wanted to be wider and smoothly turn left. Some negotiation seems to have occurred between those two entities. The result is delightful because the balcony nourishes the alley and the alley nourishes the balcony. This seems to be a definition of beauty: beauty happens when entities draw their raison d'êtreand wholeness from the extent to which they are complementary parts of an interlocking whole.
The alley is probably a meter-and-a-half wide. At this level of closeness, one can sense the recently baked pain au chocolat smells permeating the calle, every item in the patisserie's display can be clearly seen. It is easy to recognize subtle details in passers-by's garments and even discern facial expressions.
Small dimensions and the resulting intimacy seem to have been erased from modern urban planning.