The Tree of Life

In Short

While hiding from Patrol ships among the ancient ruins of Martian Illar, space outlaw Northwest Smith encounters a mysterious, luminous woman weeping near an ornate, tree-grille well. Following her into a shadow, he slips through a rift in space into a tapestried twilight world. There he discovers a dwindling, timid tribe of ancestral Martians who live in constant terror of a deity named Thag. Smith is lured into the presence of the Tree of Life, a terrifyingly symmetrical, living entity that draws victims into its grasp. He must use his wits and weapons to destroy the monstrosity and escape back to his own reality.

The Story

Fleeing from searching Patrol ships after his vessel is crippled, space-wanderer Northwest Smith takes refuge in the dry, ancient ruins of the Martian city of Illar. Crouching in the shadow of a ruined temple, he remembers that old Martian structures often featured an outer courtyard well for travelers. He cautiously approaches the miraculously preserved well, decorated with a time-defying bronze grille depicting a tree-of-life pattern.

Within the shadows, Smith discovers a shimmering, luminous woman veiled in long dark hair. Though her spoken words sound like unintelligible gibberish, her intense, translucent moonstone eyes project clear thoughts directly into his mind. Desperate and weeping, she begs him to guide her back to "the Tree of Life." When Patrol ships suddenly zoom overhead, Smith leaps into the intricate shadow cast by the well's bronze grille to escape discovery.

Instead of striking pavement, he steps straight through an optical illusion into another dimension—a quiet, gray twilight land with tapestried, blurred landscapes and flower-spangled grass. The luminous woman, now clear and radiant, leads him through the twilight, explaining in his mind that she is bringing him to "Thag," who desires him. Unsettled by her strange hypnotic pull, Smith breaks away from her grip and decides to retrace his steps.

Left alone in the silent, boundary-walled twilight, Smith wanders until he encounters a shy, dark-skinned folk living in hidden leaf-huts within a hollow. They speak an extraordinarily ancient root of the Martian dryland tongue. The timid tree-people warn him in rustling whispers that Thag is the inescapable center of creation who hungers for food, sending his white-glowing priestess to lure victims to him.

Determined to face the mystery directly, Smith follows the directions given by the tree-folk toward the center of the hollow. He reaches a clearing dominated by a singular, hyper-real Tree whose terrifying symmetry and writhing, blood-red flower-hoods instil an overwhelming, instinctual terror. As the priestess returns, leading hypnotized victims to the plant, a humming, sweet, cosmic music fills the air, paralyzing Smith's will and drawing him mechanically toward the clearing.

Up close, Smith's mind finally registers the true horror: the visible Tree is merely a three-dimensional outline of Thag, an imponderable, monstrous entity hovering above, using the plant as an anchor to absorb its sacrifices. As the hot, writhing branches seize Smith and hoist him up into Thag's terrifying bulk, he manages to draw his force-gun. Reasoning that Thag's anchor is vulnerable, he shoots a flame-blast directly into the base of the Tree's trunk. The annihilated root triggers a catastrophic energy feedback. Space snaps back to its original geometric contours, dissolving the twilight realm into another dimension while hurling Smith safely back into the moonlit, dust-choked ruins of Illar.

How It Unfolds

Trapped in dead Illar Stranded by Patrol fire in dry Martian ruins, Northwest Smith seeks shelter in an ancient temple courtyard housing a preserved bronze well grille shaped like a tree.

The translucent stranger Smith encounters a blurry, luminous woman weeping in the dark, whose moonstone eyes project frantic mental pleas to be led back to the Tree of Life.

Into the tapestried dusk Plunging into the well grille's shadow to avoid an overhead patrol plane, Smith slides through an optical illusion into a gray twilight world of blurred, flower-covered landscapes.

Warnings in the leaves Abandoning his alluring guide, Smith meets a timid tribe of dark-skinned tree-dwellers who warn him in whispering ancestral speech about Thag, a hungry god whose priestess lures sacrifices.

The terrible symmetry Smith reaches a clearing to find a living, writhing Tree whose dreadful geometric branches and blood-red blossoms inspire an uncontrollable, paralyzing horror.

The siren song A cosmic dynamo's humming music fills the twilight, overwhelming Smith's mind and forcing his body to walk helplessly toward the Tree alongside other hypnotized victims.

The true shape revealed As the branches grab him, Smith realizes the Tree is merely a physical anchor for Thag, a monstrous entity hovering in the air to devour its prey.

Blasting the anchor Struggling in the hot, coiled limbs, Smith fires his force-gun into the Tree's root, destroying Thag's hold on reality and snapping the warped space back to the Martian ruins.

The People

• Northwest Smith: A steel-pale-eyed spaceman, pragmatic and cautious, who is driven by curiosity and a hardened survival instinct. Trapped in ruins and targeted by patrol planes, he risks stepping into a spatial rift. When confronted by supernatural forces and hypnotic siren songs, his trained spaceway discipline and quick trigger finger allow him to keep his head and destroy the spatial anchor of a cosmic monstrosity.
• The Priestess: A radiant, white-glowing woman with long dark hair and milkily translucent moonstone eyes. She speaks an unintelligible gibberish while projecting powerful hypnotic thoughts into the minds of her victims. Her role is to wander the borders of dimensions to lure fresh prey back to the clearing, pacing with precise, liquid grace as she gently delivers victims to her god's waiting branches.
• The Tree-People: A tribe of small, dark-skinned, large-eyed bush-dwellers who inhabit cunningly woven huts in the twilight hollows. Degenerated over millions of years from ancient Martian plainsmen, they speak only in soft, rustling whispers and live in perpetual terror. Despite their deep-seated timidity, they retain enough kindness to warn Smith of Thag's appetite and mourn his inevitable march toward the clearing.
• Thag: An imponderable, cosmic entity existing partly outside normal space, requiring a physical, tree-like anchor to feed on living victims. It generates a irresistible, sweet music that hypnotizes its prey before lifting them into its monstrous, hovering mass.

In Its Own Voice

"Its rim had been inlaid with a mosaic pattern whose symbolism must once have borne deep meaning, and above it in a great fan of time-defying bronze an elaborate grille-work portrayed the inevitable tree-of-life pattern which so often appears in the symbolism of the three worlds."

(Smith observes the miraculously preserved well structure in the temple courtyard just before discovering the weeping stranger.)

"Its tracery flowed round him, molding its pattern to his body. And outside the boundaries everything executed a queer little sidewise dip and slipped in the most extraordinary manner, like an optical illusion, into quite another scene."

(Smith leaps into the shadow of the bronze grille to escape an overhead patrol plane, crossing dimensions into the twilight world.)

"That Tree was only Thag's outline, sketched three-dimensionally upon the twilight. Its dreadfully curving branches had been no more than Thag's barest contours, yet even they had made his very soul sick with intuitive revulsion."

(Smith realizes the true nature of the living plant as he is lifted toward the hovering monstrosity.)

What It's Really About

Beneath its pulp adventure exterior, the narrative explores the terrifying fragility of human perception and the immense, unmapped geometry of the cosmos. The plot poses questions about how humanity copes with horrors that transcend normal sensory limits; Thag is initially invisible not because it hides, but because the human mind actively rejects registering a shape so fundamentally blasphemous to natural order. Additionally, the story contemplates cosmic degradation and time. The quiet, timid tree-people—dwindled descendants of a once-mighty Martian civilization—demonstrate how absolute fear and isolation over millions of years can reduce a proud species to whispering shadows. Courage is defined not by the absence of terror, but by the conscious, disciplined effort to pull a trigger when instinct demands utter surrender.

Why Read It Today

Fans of classic planetary romance and cosmic horror will find much to admire in C. L. Moore's evocative writing. Reading this tale feels like stepping into a lush, uncanny dream: the imagery shifts seamlessly from sun-baked, ancient ruins to Botticelli-inspired twilight meadows carpeted with pale blossoms. Moore excels at building an atmosphere of subtle dread, using sensory details—the throb of cosmic dynamos, the hypnotic glare of moonstone eyes, and the terrifying symmetry of alien plant life—to ground her imaginative science fiction.

The story presents minor hurdles typical of 1930s pulp magazine fiction. Modern readers may notice the melodramatic pacing and the somewhat simple characterization of its heroic protagonist, who relies heavily on archetype and convenient spaceman instincts. The depiction of evolutionary degeneration also reflects period sci-fi tropes regarding ancient alien races. Nevertheless, Moore's poetic prose, incredible visual flare, and masterful handling of cosmic horror make it a memorable, haunting read that lingers long after space snaps back into place.