Ringelnatz, Joachim. Secret children's game book with many pictures. I Bl., 48 pp., 1 Bl. With 11 textile illustrations by the author. 18,5 x 17 cm. Coloured illustrated OPapp band (back slightly brittle, with brown spot). Potsdam, Gustav Kiepenheuer, 1924. Kayser-des Coudres 25th – First edition. With the well-known derb-common jokes, which the Journal of Sexology XI (1924) characterized as a "lascive irritation of the sadistic component of infantile sexual feeling". The passus "For children from 5 to 15 years of age compacted and illustrated" on the front cover had to be covered by the note "Only for adults". – Well-preserved. – At the same time: The same. Children's confusion book. 66 pp., 1 Bl. With 15 textile illustrations by the author. 18,5 x 17 cm. Coloured illustrated OPapp band. (small spot, slightly tanned). Berlin, Ernst Rowohlt, 1931. - Kayser-des Coudres 33. - First edition. The counterpart to the children's play book, in substance, is in no way inferior to this: "The difference between man and woman /is exactly seen through the keyhole." - Well-preserved.