The latter decision occurs when a participant falls into the arena during the leap, leaving behind a pile of dust which marks the passage, gives the realm its name, and when disturbed allows the one doing so to enter a hidden chamber where they play a game of the individual's choosing against the Ringmaster.
In the Factory, Ryan regains his voice and is reunited with his grandfather (Armin Mueller-Stahl), whose Alzheimer's disease has (in his real life) prevented him from communicating with his family.
Throughout the main body of the plot, Ryan spends a single endless day exploring the Dust Factory under weather conditions that are always favorable to wandering through the environments and marveling at natural beauty.
He is guided by his grandfather and accompanied by a girl of his own age called Melanie Lewis (Hayden Panettiere), who has been in the Dust Factory for years, lacks any memory of her previous life, and lives under the illusion that the climate is of perpetual winter, despite the appearance to Ryan and the viewer of interminable summer.
Although he no longer has any conscious memory of the Dust Factory, it seems to be present in his subconscious, as implied by the facts that he has regained his voice, and a general feeling of joy in life.