Tatami (Japanese armour) the other related parts of a full suit of Japanese armour. Collapsible head protection such as "" and other collapsible armor are also "tatami" armor; a traditional kabuto could also be part of a tatami gusoku. Tatami armour was lightweight, portable, convenient for transportation, and they were manufactured inexpensively for the ashigaru light infantry. Tatami armours were worn by all samurai classes from the highest class to the lowest class. The higher class samurai wore elaborate armour while the lower class samurai and retainers wore simpler versions. In his book "Arms and Armor of the Samurai: The History of Weaponry
A Sixth Part of the World first group of "kinoki" ("cine-eyes") in which he began to issue the "Kinopravda" ("Cine-truth") serie of films. At that time, Vertov published essays in specialized publications detailing his theories on cinema. In 1924, the Goskino film production company set up a documentary section called Kultkino and Vertov was placed in charge. That year, Goskino was replaced by Sovkino, which continue to operate the Kultkino section. In 1925, Gostorg, the Central State Trading Organisation, was seeking a director for a film promoting internal trade and praising the merits of the new social order. "A Sixth Part of the World" was produced