Pod

A Pod (ポッド) is a flower-shaped device. Naminé placed Sora, Donald, and Goofy in several Pods to sleep as she reassembled their memories.

Kingdom Hearts Chain of Memories
Naminé brings Sora to a Pod so she could restore his memory to how it was before the Castle Oblivion incident.

Kingdom Hearts 358/2 Days
DiZ works with Naminé to restore Sora's memories as he slumbers in the Pod. He persuaded her to move the Pods to his secure laboratory in the basement of Twilight Town's Old Mansion, as Castle Oblivion was too at risk to intrusion by Organization XIII. During the reconstruction, he digitized himself and his research on Roxas, Axel, Naminé, Xion, Terra, Ventus, and Aqua, and hid them within Sora's memories, hoping they could eventually be used to find these lost friends.

Kingdom Hearts II
Many are seen in DiZ's laboratory in Twilight Town.

Kingdom Hearts coded
Sora's Pod, watched over by Naminé, appears in the Journal's data reconstruction of Castle Oblivion.

Kingdom Hearts II opening FMV
When Sora reaches Naminé's room at the top of Castle Oblivion, she surprises him by sketching him inside of a Pod, which then sprouts around him and closes.

Design
The Pods are crystalline devices. When closed, they resemble a marble structure in the shape of an unbloomed. They open by "blooming", revealing a crystalline chamber within, covered by circuitry. The crystal is usually transparent when not in use. The interior of the pods is completely black and gives the illusion of a large, shadowy room. They can come in multiple sizes, as Donald and Goofy sleep within small Pods arranged in rows in the Basement Corridor, while Sora sleeps within a much larger Pod placed by itself in the Pod Room.

Notes and References
🇰🇲

Erinnerungsgefäß