Even four years after the end of the war, references to war themes and Paul Klee's experiences are still to be found in his work: For instance the picture "The Dart House". Only the indication of the weapon in the title and the exact depiction of such a bullet, is reminding Paul Klee of the First World War. The picture itself emanates nothing warlike. Apparently Klee was interested in combining the contrasts of movement, statics and gravity. The massive building, constructed of coloured areas, which strangely appears to hover in the space, lends the seemingly delicate and vertically downward plunging arrow, a sudden weight. The arrow apparently not only keeps the house in the picture, preventing it from floating away, but pulls it forcibly downwards.