A Sphynx cat at the 2017 Grand Prix Royal Canin international cat show at the Crocus Expo Exhibition Centre in Moscow, Russia on December 2, 2017. (Photo by Sergei Savostyanov/TASS/Barcroft Images)
A model prepares backstage during the bridal fashion show as a part of Yes Wedding Expo at Convention Hall Tunjungan Plaza on June 13, 2021 in Surabaya, Indonesia. (Photo by Robertus Pudyanto/Getty Images)
A visitor checks automatic gun during International Defence Exhibition and Seminar (IDEAS) 2022 at the Expo Centre in Karachi on November 16, 2022. (Photo by Rizwan Tabassum/AFP Photo)
Children stand next to an image of a Chinese space suit displayed on a screen, at the InnoTech Expo in Hong Kong, China on December 13, 2022. (Photo by Tyrone Siu/Reuters)
A picture released by the North Korean Central News Agency (KCNA) shows Kim Jong-un convening an urgent operation meeting at 0:30 am on March 29, 2013 at an undisclosed location, in which he ordered strategic rocket forces to be on standby to strike US and South Korean targets at any time. (Photo by KCNA via EPA)
Dancers Marion Krebs and Judy Ness, right, pose as batter and catcher in front of the Chicago White Sox dugout before start of game with Detroit at Comiskey Park, Chicago, Ill., September 18, 1959. White Sox won, 1-0, to move within two games of clinching the American League pennant. (Photo by AP Photo)
Midfielder Lindsey Horan (9) of Team United States and midfielder Kosovare Asllani (9) of Team Sweden go up for a header during the first round of the Tokyo 2020 Olympic Games at Tokyo Stadium on Wednesday, July 21. 2021. Sweden defeated the United States of America 3-0. (Photo by Toni L. Sandys/The Washington Post)
Klemens Torggler's door is an invention based on rotating squares, The special construction makes it possible to move the door sideways without the use of tracks. This technical trick opens up new applications for the door.