Physicists have proposed a new concept called spacetime quasicrystals, orderly structures that never repeat but exist across space and time. If proven, they could help explain the universe’s deep structure, quantum gravity, and hidden dimensions, while preserving key laws of relativity even at extremely small scales.Physicists have proposed a new concept called spacetime quasicrystals, orderly structures that never repeat but exist across space and time. If proven, they could help explain the universe’s deep structure, quantum gravity, and hidden dimensions, while preserving key laws of relativity even at extremely small scales.