Atlantis is a lost island and ancient civilization whose surviving material sets the novel’s interworld adventure in motion. It is introduced through the Atlantean box and the fine dust inside it: a remnant from another world, and evidence that the limits of ordinary travel can be crossed by Magic.

The Lost Civilization

Uncle Andrew identifies the box as Atlantean after studying it and ruling out several better-known ancient cultures. He describes Atlantis as centuries older than the Stone Age objects excavated in Europe, yet not crude or primitive: in his account, it was already a great city of palaces, temples, and learned men at the dawn of time. Atlantis enters the story not as a setting to be explored but as a vanished civilization whose sophistication survives in a small, secret object.

The box had been kept by Mrs. Lefay, who, shortly before her death, sent Uncle Andrew to retrieve it from a secret drawer in an old bureau. She gave it to him on the condition that he burn it unopened, with certain ceremonies, after her death. He broke that promise, explaining that the prickling in his fingers had made him feel he held a great secret. His choice turns an inherited relic into an instrument of dangerous inquiry.

The Box and Other Worlds

Uncle Andrew says the box contained only fine, dry dust. He believed the dust had been brought from another world when the human world was just beginning—not another planet within the same universe, but a genuinely separate nature or universe, reachable only by Magic. The tiny, unimpressive substance thus carries an immense implication: other worlds are not merely distant places but distinct realities with which contact is possible.

His account also exposes the gap between magical ambition and understanding. Andrew spends years investigating the box and learning about Magic, but his eventual confidence does not mean he grasps how the Rings actually work. He assumes that Yellow Rings take their wearers outward and Green Rings bring them home. In fact, Yellow Rings draw a person into the Wood between the Worlds, while Green Rings carry a person out of the Wood into another world. Both kinds are made from material that came from the Wood, and their powers reflect whether that material is drawn back to its place or seeks to leave it. Atlantis supplies the relic at the beginning of Andrew’s experiments, but it does not make him a reliable interpreter of what he has found.

Material Traces and Lasting Connections

The story repeatedly makes distant worlds consequential through matter that crosses their boundaries. The Atlantean dust is one such trace; later, the iron bar Jadis tears from a London lamp-post sinks into Narnian soil and grows into a new lamp-post. Digory recognizes the growing post as the same bar, transformed by Narnia’s life-giving conditions. These objects make the passage between worlds visible not as an abstract idea but as a change in the material world.

A later chain carries that connection back to England. The Apple of Life that Digory plants in his garden grows into a fine tree. Its English apples are exceptionally beautiful and healthy, though they do not have the power to revive the dying as the Narnian apples do. The tree nevertheless retains a bond with its Narnian counterpart: it sometimes moves when there is no wind, as if answering the Narnian tree’s motion in a gale. After a storm blows it down when Digory is middle-aged, he has some of its timber made into a wardrobe. Its wood still holds magic, and the wardrobe becomes the beginning of further journeys between Narnia and the human world. Atlantis itself remains remote and unvisited, but its box belongs to the same material history through which separate worlds touch and leave traces in one another.