This is a question for the Simulation Hypothesis, which posits a computer-generated video game version of reality. Many proponents like Rizwan Virk are popularizing the theory. (See The Simulated Multiverse)
Nir Ziso, for example, of The Global Architect Institute, offers his version of Simulation Creationism. Each theorist has a different picture but certain assumptions are held in common: reality is a mental construct, perhaps devised by a higher being or ancestor generation interested in studying creation and human life.
In short, we live in an altered reality akin to a VR video game of the highest caliber. We are mere characters in a play, acting like humans. It likely will not be our choice. So it is either a game-world or brane-world. The latter refers to the universe as a kind of membrane (brane) in a higher-dimension sphere. So says Giulio Prisco.
Prisco calls it “advanced beings in the bulk” although it is a bit enigmatic. They design, build, and run the brane-world, functioning as ultra-advanced engineers. This “cosmoforming” hypothesis equates to Simulation Theory in new guise, with the exception that there is but one universe: that of string theory. For him, this is the simplest visual picture of a simulation or “simulation-like” cosmology.
String theory at a glance uses 10 or 11 dimensions involved in complex geometries, beyond the pale of the Simulation Hypothesis. Just take Prisco’s word for it lest you wade in a mire of modern mathematics. It might help to visualize the two-dimensional surface of a giant soap bubble in the “bulk”. This is our brane-world built by those amazing fictional engineers.
How did they do it? Apparently, the bulk engineers use gravitational signals that propagate. Interactions ensue with the brane-world, and in the end, it is all about scanning and monitoring. This reminds us of Nir Ziso’s observer in Simulation Creationism. It is nice to see theories collide.
Future human engineers could have access to the bulk’ and if one was resurrected, we could learn from the past and apply it to the present. For Prisco, there is one, undivided reality, in contrast to concepts of a multiverse of billions of copies.
In another vein, philosopher Alyssa Ney posits one big quantum wave function. “We and all of the objects around us are ultimately constituted out of the wave function.” In Mad-Dog Everettianism”(1, 2) co-authored by Sean M. Carroll and Ashmeet Singh, the authors state, “What is fundamental does not directly involve spacetime or propagating quantum fields, but simply a vector moving smoothly through a very large-dimensional Hilbert space.”
Thus, we come to an undivided reality derived from emerging concepts like particles and quantum fields, strings, brane-worlds, not to mention parallel Everett worlds (the brainchild of scientist Hugh Everett, or computed worlds. We can now equate the simulated universe (or multiverse for some), the brane-world, or their cosmoforming pictures.