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In page Sedlec Ossuary:

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In 1970, the 100th anniversary of Rint's contributions, Czech filmmaker Jan Švankmajer was commissioned to document the ossuary.[1] The result was a 10-minute-long frantic-cut film of skeletal images overdubbed with an actual tour-guide's neutral voice narration. This version was initially banned by the Czech Communist authorities for alleged subversion,[citation needed] and the soundtrack was replaced by a brief spoken introduction and a jazz arrangement by Zdeněk Liška of the poem "Comment dessiner le portrait d'un oiseau" ("How to Draw the Portrait of a Bird") by Jacques Prévert.[2] Since the Velvet Revolution, the original tour guide soundtrack has been made available.