Ini konvensional didefinisikan oleh ukuran cincin aperture, "8-cincin" pada loop  silikon tetrahedral terkoordinasi (atau aluminium) atom dan 8 atom oksigen.

Past Lives. Parallel Lives. The ears of the dying man are filled with the final clamourings of earthly life: thousands of whispering voices, automobiles, a jazz band,  glasses clinking, billiard balls striking billiard balls. And a wind, a wind that comes closer, and closer still, and which he recognizes, finally, as the sound of his own breathing.