Those are the film's best moments: when it confronts the sublime via literal darkness and mystery. Wan pushes these moments of dread from the unknown in some scenes to the point of comedy, mostly via Elise's surviving assistants, Specs (Leigh Whannell) and Tucker (Angus Sampson). You can't be in here, one spirit, a little girl in pigtails, tells them. If she sees you, she'll make me kill you. The threat of the unknown from forbidden trespass is encapsulated in those lines. The fact that Specs and Tucker take this warning very seriously verges on humorous because it satisfies that urge to tell the characters on screen to get out before anyone can yell their advice at the screen.
If there is fault in Insidious: Chapter 2, it comes in the form of further rationalizing this world Wan has created with writer/actor Whannell. The better horror movies plummet further into the darkness of mystery rather than trying to shed light on the motivations of evil spirits. This second chapter offers further explanation of the spirit world journey that closed the first Insidious. Though some may find relief in this, over-explanation also saps the film of its creepy energy, which Wan works so shrewdly to draw up.
Even though he leans on some cinematic horror tropes, as noted earlier, the film's eerie atmosphere has a signature stylistic flourish. He uses low angles to present his looming haunted houses in shadowy darkness, but Wan serves up a subtle new ambiance for the genre with the help of production designer Jennifer Spence. Bright patches of color here and there liven up the sets, especially a reliance on red accents, be it on doors, stained glass or parts of clothing. But the rest of his world features darker shades of color, often painted thick on nice solid, creaky wood. There is also a whimsy to his sets featuring clouds of fog billowing from out of nowhere and slow fade outs and fades to black, lending a surreal atmosphere to the happenings in Insidious: Chapter 2. There is nothing like the irrational to pull the rug out of reality and unnerve the audience, and the film is at its best lingering and peering at that edge.
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