Just about everything I know about this wonderful artist, Oreo, I have found out from the excellent No Grey Walls blog, written by Lewis Duncan, who was pivotal in directing me to some great legal walls in Barcelona for my trip there just before Easter.
The artist of this bear character is French artist Oreo (also painting under the names of Zack aka the scientist and Badassbearz). His works, which are instantly recognisble, appear all over Barcelona, and I managed to bag a few during my stay of which this was the first. In this piece Oreo presents us with the good and the bad bear and cleverly uses the box in the middle of the wall to separate out the two sides. Nice crisp work.