One of the guiding principles at the farm that I stayed at in Sao Carlos was the relationship between art and the garden.
Rare is the wall without a mural on it. And if you see a wall without a mural on it, you are encouraged to cover it up with some art.
Although this site is in the middle of the city, the combination of plants and art give the impression of it being in a totally different reality.
I didn't contribute to any of the murals around the property, but I did put another coat of white paint on the chipped wall in the kitchen.