Wikipedia says:
House of Leaves is the debut novel by the American author Mark Z. Danielewski, published by Pantheon Books. Some pages contain only a few words or lines of text, arranged in strange ways to mirror the events in the story, often creating both an agoraphobic and a claustrophobic effect. The novel is also distinctive for its multiple narrators, who interact with each other throughout the story in disorienting and elaborate ways. The novel quickly became a bestseller following its release on March 7, 2000.

This movie is a realization of the animated “nature” of the book taking a cue from the printed formatting that evolves and builds on itself like a time based visual work.