File:Cirkus v cirkuse 1975 film poster.jpg

Summary
The image linked here is claimed to be used under fair use as:

It is a low-resolution copy of a film poster, Its use here does not limit the copyright owner's ability to market the film in any way, It is being used for informational purposes only, not for profit,

Specifically,

In Circus in the Circus, it is the best possible way to illustrate the subject.