Received in three different occasions, I'm happy to discover that I have all four stamps from the miniature sheet called Art Post 20--15. It was released by the Finland Posti on 11 September 2015. The four designs are by the creative agency Vanhatapio and Saksi. The theme for the designs are "cinematic and literary references that allow the imagination to create the set and setting for events".
Click on See it on a Postcard to discover what other participants shared for the theme, eastern hemisphere.