Between the wars he published in different periodicals, particularly in
Literatura Mondo (
Literary World), and wrote two volumes of poetry. His poetic works
Verdkata testamento (
The Will of the Green Cat) (1926) and
Stranga butiko (
The Strange Boutique) (1931) are imaginative and humorous fantasies involving word games, characteristics also found in
Prozo ridetanta (1928) (
Smiling Prose). His short novel
Anni kaj Montmartre (
Annie and Montmartre, 1930) recounts the adventures of a young naîve German woman in Paris; it departs from the conventions of original Esperanto literature, in particular because of its style of writing. From 1933 to 1935 he published the monthly satirical magazine
La Pirato (
The Pirate), which made him a sort of
enfant terrible of the
Esperanto movement, one for whom there were no secrets and for whom everything was an occasion for humour. His masterwork, published after
World War II, is ''Kiel akvo de l' rivero
(Like the water of the river''), considered as his most significant and most moving book. This is a partly autobiographical novel of a young Frenchman from the Franco-German frontier who comes to Berlin after graduation but must flee at the outbreak of war in 1914. During the
occupation of France by Nazi Germany he joins the
French Resistance. After the war he once more meets in Paris the woman he loved as a young man in Berlin. This classic novel about a family torn apart by two world wars is both serious and amusing. He collaborated on
Sennacieca Revuo, an annual cultural review published by
Sennacieca Asocio Tutmonda (World Non-National Association), writing a column titled "Laŭ mia ridpunkto". The name was a
portmanteau word formed from
vidpunkto, (Esperanto for "viewpoint") and
ridi ("to laugh"). The column itself was written in a humorous style that included
kalemburoj (
puns) and
antistrofoj (
spoonerisms). ==Cabaret==