this is a business exhibition place, take a close look to one of the wall that was made of aluminum extrusion, there are three straight racks to support the wall, so the wall was devided into three parts. both three parts of the wall has blue plastic boards pasted on, on the plastic there are business words, company logo, graphic on it. one of the blue plastic boards was peeled a half of it, reveal the thickness of the blue plastic board. zoom in to show the thickness of the blue plastic board