we looked very hard at e tfe. it's a wonderful material, a plastic material. if you remember the swim cube at the beijing olympics, that was etfe, the soccer stadium in munich, very well publicized building. it's a great material. the issue is that in our experience it does not age very well. it tends to get dull and tends to get rather used quickly. so it was a

we looked very hard at e tfe. it's a wonderful material, a plastic material. if you remember the swim cube at the beijing olympics, that was etfe, the soccer stadium in munich, very well publicized building. it's a great material. the issue is that in our experience it does not age very well. it tends to get dull and tends to get rather used quickly. so it was a material we discarded but we did look at it at some length. the issue of birds and maintenance, of course is an issue with glass as well. we have an extensive program by use of certain materials and the structure itself to ward off birds. that part of the wall though frankly is still being looked at and the aluminum scheme is still being looked at. we have to report to you at some detail. aluminum is not wrong, it does tend to pit and corrode if the surface is not treated adequately at the time of manufacture, also that might be the case to paint the aluminum rather than leaving it exposed that's one of the reasons why paint is still being looked at. the issue of aluminum being flammable that is also w