Art-house: a serious, independently-made work aimed at a niche audience rather than a mass audience, whose formal qualities mark them as different from the mainstream, which includes, among other elements: a social realism style; an emphasis on the authorial expressivity of the creator; and a focus on the thoughts and dreams of characters, rather than presenting a clear, goal-driven story.  — Wikipedia.org excerpt from Art Film

Novella: The novella is a fictional narrative of indeterminate length—a few pages to hundreds—restricted to a single, suspenseful event, situation, or conflict leading to an unexpected turning point, provoking a logical, but surprising end; Novellen tend to contain a concrete symbol, which is the narration’s steady point. — Wikipedia.org excerpt from Novella