The passage into the Tunnel of Yamatu is shown in cross-section. Above is a circle of standing stones, symbolic of the God Set upon whose sigil they rest, and which serves as threshold into the forbidden realm below. From ancient times stones such as these, the Callanish Stones of Outer Hebrides, Scotland, have been raised to serve as Gates through which the Great Old Ones of the Outer Void might enter human consciousness. The central altar has been engraved with names of Them From Outside human space and time. It is the Stone Seat, the Throne of Isis upon which the magician rests, where s/he takes the god-form of Hoor-paar-kraat, hand making the Sign of Silence, and ready to enter the dark realm of Amenta