Describe the interior.
Positions. Events. Geometry. A vocabulary of things taking place within a space.
Keep the order of the events. Keep the quantities you intend to compare. Do not keep an appearance simply because it is familiar.
DIFFERENT ALPHABETS / CHECK THE DICTIONARY
A room.
A rule.
Two accounts can look unlike one another
and still answer the same question.
Describe the translation.
A different vocabulary may describe the same structure. A duality is stronger than a visual resemblance: it requires a correspondence between the things each account can calculate.
One influential theoretical correspondence connects certain gravity theories in anti-de Sitter space with conformal field theories at a boundary. Its setting matters; applying the picture to our universe is a separate question.
there is no equals sign between these pictures
The image and the text are metaphors for translation. They do not establish a physical duality. Look for the dictionary, not the resemblance.
read the other side of the wall →
IMAGE
≠
DICTIONARY
≠
PROOF
A loose leaf: Maldacena / The boundary correspondence ↗