Tokyo Olympic and Paralympics Games Organizing Committee invited media to observe lifting of large roof of Olympic Gymnastic Centre, which will be the venue for gymnastics. Shimizu Corporation is involved in the architecture of this building and many overseas media attended this event to observe the innovative and progressed Japanese technical architecture. This Lift-up method of construction is adopted by Olympic Gymnastic Centre in for the purpose of shortening construction time and safety management. Huge wooden arch - 70 meters in width and 200 tons in weight - was slowly lifted up to 30m height over five hours. One of the best features of this stadium is that it will include the largest amount of wood used in Tokyo Olympic and Paralympic games facilities. In addition, all the wood used in the construction is made in Japan. This Distinctive roof will be the world's largest wooden roof. The stadium itself is designed similar to Japanese old wood building. To support large roof of the stadium, arched beam structure is adopted incorporating the principle of bow with wooden arch and iron auxiliary wire cable. Tokyo Olympic and Paralympic Games are just about two years after and thanks to Japanese building high technology many Olympic facilities are starting to take shape.