It's also known by its scientific name, the Fourth Dimensional Core Square Ring 四次正角性中核環, shiji seikakusei chuukakukan?, lit. "Autostabilizing Nuclear Tesseractal Loop"), and it could be said that it's the next level after the Triangular Nuclear Loops, which serve as the Hearts of the Reyvateils. The Hearts of the Land have generally the same shape, but their size is highly variable: hypothetically, at their max size, they could create a continent several thousand Stons in size. Its FFT Spectrum Oscillation Limit is of 1 x 10^20 Hz.