As far as I gather, it's from the 'anti-communist' fase, a relitavely minor piece technically, but a stunning political message. We see the excellent use of brushwork perfected in Neuchwanstein Scloß and Das Brandenburger Tor, but with the stirring use of colour that made such a headway in the later works, such as New Yorken Zug, that so empitomised the Art Deco movement.