system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: The theory that the universe is a hologram.
gpt
All the holographic principle means is that the information contained in a volume, can fit on it's boundary. To try to ELI5: If you had a sphere filled with particles, the state of all those particles will fit on the surface of the sphere. Thus you don't "need" the 3-dimensional sphere, all you need is the 2-dimensional surface to describe the state of the system.