This is a good advice in general as it may prevent you from walking into other people on the street or worse, a light post ;-/
My mother always told us to look up when in a city in order to see more. Milan is a beautiful city with so many magnificent buildings with great sense of detail!
Many Milanese live in the city during the week and then escape the city to get closer to nature on the weekends – especially in the summertime.
Not everybody is so fortunate, but they still manage to have a little piece of nature close by. If you look up as you stroll down the streets of Milan you will discover a whole world of green wonderful gardens on rooftops and balconies. Even the small balconies can be covered with trees and plants. The Italians choose not to use the balcony as many “northerners” would, but rather to arrange for something beautiful to look out at from inside their apartment. Not a bad idea actually – just takes a little getting used to for a Dane like me to whom it would be an obvious chose to use a balcony for a lunch, coffer or sunbathing.