There has been plenty of inquisition about the "gray" bricks on the new mall surface to justify a post devoted to just this subject matter.
The gray bricks are actually pieces of granite cut to be the size of a 4x12 brick. The purpose of these off-colored brick is to designate the fire lane, and, the cafe/vendor spaces. As seen in the picture below; the two granite bricks come together to delineate the extent of the vendor's allotted space.
