Inside of the Prime Manufacturing Co. building at the corner of Washington and Union streets you will find an array of vintage neon signs collected by the owner, David Waller. Waller started seriously collecting in the 70s, largely taking pieces from old Boston, but never shying away from a unique piece such as a vintage McDonald’s sign. Pieces from his collection can be seen hanging and lit up on the side of the building as part of the Beyond Walls public art installations.