Primer (film)

Lore & Background

Two engineers, Aaron and Abe, supplement their day jobs with entrepreneurial tech projects, working out of Aaron's garage. During research involving electromagnetic reduction of objects' weight, they accidentally discover an 'A-to-B' causal loop side-effect: objects left in the weight-reducing field exhibit temporal anomalies, proceeding normally then backward in a continuously repeating sequence. Abe refines this and builds a stable time-apparatus ("the box"), sized to accommodate a human subject. Abe uses this box to travel six hours into his own past, staying in a hotel room to avoid interference, then entering the box and waiting six hours. After exiting, he explains the proceedings to Aaron and brings him to the self-storage facility housing the box, where they watch the earlier version of Abe enter the box.

Abe and Aaron repeat the six-hour experiment multiple times over multiple days, making profitable same-day stock trades. Their divergent personalities – Abe cautious and controlling, Aaron impulsive and meddlesome – put strain on their collaboration. Time travel is taxing on their bodies: their days become 36 hours long, and they begin to notice alarming side effects such as earbleeds and progressively worsening handwriting. Tension comes to a head after a late-night encounter with Thomas Granger, who appears inexplicably unshaven and exists in overlap with his original self. Granger falls into a comatose state after being pursued by Aaron. Abe concludes time travel is too dangerous and enters a secret second box, traveling back four days to prevent the experiment's launch.

Cumulative competing interference wreaks havoc upon the timeline. Future-Abe sedates Original-Abe and meets Original-Aaron at a park bench, but finds that Future-Aaron has gotten there first, having brought a disassembled "third failsafe box" four days back. Future-Abe faints at this revelation. The two men briefly reconcile, jointly traveling back in time to reshape an event where Abe's girlfriend Rachel was nearly killed by a gun-wielding party crasher. After many repetitions, Aaron stops the gunman, becoming a local hero. They ultimately part ways; Aaron considers a new life in foreign countries, while Abe states his intent to remain in town and sabotage the original box experiment. Multiple "box-aware" versions of Aaron circulate, and an Aaron directs French-speaking workers in the construction of a warehouse-sized box.

Reader's Guide

Primer is significant for its portrayal of scientific discovery in a down-to-earth and realistic manner, as intended by Carruth. He noted that many breakthrough discoveries occur by accident in unglamorous locations, and he wanted to depict that rather than the typical neon-lit prototypes. The film's central theme is the breakdown of Abe and Aaron's relationship due to their inability to cope with the power afforded by time travel. Carruth deliberately obfuscated the plot to mirror the complexity and confusion created by time travel, aiming to put the audience in the same position as the characters. The film was produced on a budget of only $7,000 with a skeleton crew of five, and Carruth acted as writer, director, producer, cinematographer, editor, and music composer. It won the Grand Jury Prize Dramatic at the 2004 Sundance Film Festival and has since gained a cult following.

Did You Know?

• Shane Carruth cast himself as Aaron after having trouble finding actors who could break the habit of filling each line with so much drama.
• The time machine's electronic 'hum' was created by overlaying the sounds of a mechanical grinder and a car engine.
• Carruth took two years to fully post-produce Primer.