Another project, the Expo 2000 Japanese Pavilion, in Hannover, Germany, also used paper tubing but at much longer dimensions of with diameters, at a less than thickness. It was also waterproofed both inside and out by a coating of polyurethane to meet testing requirements for extreme weather conditions and fire protection. Surprisingly, the paper tubes are very difficult to burn due to the high density of the material. Ban's design allowed for full recyclability of the Japanese Pavilion, in keeping with Expo 2000's theme of environmental awareness. Fabric tape was used instead of mechanical joinery. The fabric tape allowed for complicated movement, and also naturally post tensioned the structure."pg32" The main tunnel of the pavilion was designed as an incredibly large space, at (L × W × H)."pg135" The fabric tape was used with a buckle system which allowed for manual construction and dismantling. Due to the strict building codes in Germany and the unconventional use of paper as a revolutionary building material, the Japanese Pavilion had to be over-designed and incorporate wooden elements, thus, becoming more of a hybrid structure. An innovative design feature was Ban's use of recyclable wooden boxes filled with sand instead of a concrete foundation."pg33"