This art was in a old industrial section of Barcelona that is being transformed with parks and new businesses. I liked how the artist has these workers with smiley faces painted on paper bags. They are coming from the factory that they work in and are probably not that happy about it.
Barcelona has some amazing street art. Make sure that you walk around when the shops are closed because many of them have art on their roll up doors. A lot of them are even customized for the business. I remember seeing croissants and pastries painted on a bakeries door.