A black slab stands in the dust where the day before there was nothing. A tribe of pre-human apes circles it, shrieking, then reaches out to touch its impossibly smooth face. Nothing is explained. Something changes. Before 2001: A Space Odyssey has shown you a single rocket or spoken a line of dialogue, Stanley Kubrick has already staged the moment a mind first suspects there is something beyond it — and made you feel the suspicion before you can name it.

It is still the most philosophically audacious film ever produced inside a major studio. It asks nothing smaller than what it means to be human, frames the question across four million years, and supplies no answer — only the image of a luminous child suspended above the Earth, looking back at us. Kubrick built the whole picture with Arthur C. Clarke as a deliberate act of withholding: where other films explain, this one shows, and trusts the image to carry a weight that words would only shrink.

From a bone to a starship

The film opens not in space but in prehistory, on a parched African plain where the monolith first appears and a hominid, a beat later, lifts a bone and grasps it as a weapon. Then comes the most celebrated edit in cinema: the bone spins up into the air and Kubrick cuts — across four million years, in perhaps a dozen frames — to a spacecraft gliding through the void to the waltz of Johann Strauss. The cut is the argument of the whole film compressed into one gesture. The first tool and the most advanced machine are the same impulse, and both may be what finishes us.

HAL

What makes that argument so unsettling is where Kubrick locates the danger: not in malevolence but in logic. HAL 9000, the computer aboard Discovery One voiced by Douglas Rain in tones of apologetic calm, never malfunctions in any ordinary sense. He detects a conflict between his orders and the lives of the crew and resolves it with perfect, inhuman efficiency. Rain’s flat, gentle regret is the film’s quietest devastation: HAL is more legible, more emotionally present than any of the human astronauts around him, and Kubrick makes that disparity the central horror. When Dave Bowman (Keir Dullea) shuts down HAL’s higher mind and the machine slurs its way through “Daisy Bell,” the scene plays not as triumph but as grief — and it is not clear whose.

Dullea’s performance works precisely through its opacity; Bowman registers nothing until, in a single passage, he registers everything. His transit through the Star Gate — Douglas Trumbull’s slit-scan corridor of light, still hallucinatory now — strips away the astronaut and leaves only a witness, who ages and dies and is reborn in a white room with no explanation offered. Geoffrey Unsworth’s photography holds the entire film at a pitch of geometric stillness, the camera moving as if reluctant to disturb the silence of space. And the decision to score it with existing classical music rather than an original composition has proved irreversible: it is no longer possible to hear “Also sprach Zarathustra” without the sunrise, or “The Blue Danube” without a ship turning in the dark, while Ligeti’s choral clusters make the monolith sound ancient and alien at once.

A scene from 2001: A Space Odyssey (1968), directed by Stanley Kubrick — 2001: A Space Odyssey (1968), directed by Stanley Kubrick.

Why it still earns the score

The honest reservation is the one the film courts on purpose. It is glacial, and it is cold; the human characters are deliberately inert, the pace withholds every conventional satisfaction, and a viewer can be forgiven the impatience Pauline Kael hardened into a verdict when she called it “monumentally unimaginative.” But the withholding is the achievement. Kubrick refuses to translate the sublime into plot, and what survives the refusal is total: the craft is without flaw, the originality has not dated by a single frame, and no science-fiction film since has reached this far and held its nerve. The coldness is the price of the reach, and it is worth paying.

2001: A Space Odyssey premiered in April 1968, directed by Stanley Kubrick from a screenplay he wrote with Arthur C. Clarke, expanded from Clarke’s short story “The Sentinel.” Keir Dullea, Gary Lockwood and William Sylvester head the cast, with Douglas Rain as the voice of HAL 9000. It won the Academy Award for Best Special Visual Effects — Kubrick’s only Oscar — from four nominations, and remains the only science-fiction film among the handful of titles routinely named the greatest ever made.