Present article deals with literary-historical phenomenon of "Zielony Balonik" theatre which
was the part of "Mloda Polska" movement, and with creative work of Tadeusz Zelenski-Boy
within it. The mode of avant-guard (post-romantic) irony is seen as the very essence of "Zielony
Balonik" performance; the analysis of basic motives of the irony in Tadeusz Zelenski's book
"Slowka" is carried out.