If you’ve been in and around downtown Oakland recently, you may have noticed the area has become proliferate with murals — even though one of Oakland’s most iconic downtown works of public art, CRP’s “The Universal Language,” has been obscured by a new high-rise ).  For most people, this is a good thing: visible art makes downtown seem friendlier and more vibrant, while offering an array of (mostly) local artists, in a dizzying blend of various styles and techniques. …