'They also came close to having another artistic collaborator: the infamously anonymous street artist Banksy. “Banksy was not yet the famous Banksy that he is now, and I dug him,” Cuarón says. He wanted to have the graffiti artist work on the film in some way, so he tracked down Banksy’s manager and arranged a meeting at a coffee shop. Cuarón sat across from the manager, who started grilling the director on his ideological stances. Banksy was nowhere to be seen. The meeting ended without resolution. Only after it was over did a person nearby excitedly tell Cuarón that a silent figure had walked in during the meeting and placed himself behind Cuarón the whole time, hidden from view, then left before Cuarón could turn around. Cuarón suspectsto their inherent properties. However, limitations with nonwovens as filtration media also stem from their inherent properties. Nonwoven webs by definition are randomly formed structures that have limited geometric order. Limited order is caused by the variability between individual fibers and the degree of fiber to fiber conformation within the web. This limited order is manifested by gross irregularities caused by the formation of macrostructures known as shingles and fiber nests. Web macrostructures have local concentrations of fibers that cause pore size variability as well as mass variability across the webs. As a result, relatively large openings between the fibers allow particles through that should have been excluded, and small openings fill and become ineffective. In filter media design these limitations are moderated by the use of additional