Forum user abner_mohl dug up this very nice short film adaptation of John Ajvide Lindqvist's short story Pappersväggar (Paperwalls). It's director and screenwriter, Tomas Stark of GOMFILM, was kind enough to give me permission to post it, and also to provide me an srt file with the English subtitles.
Johan's father brings home a big cardboard box. It is Johan's place of dreams and fantasies. But the box also comes with contact with an invisible presence of someone.
You can discuss this short film with other fans in the forum here.