The oldest magic mirror is a pool of still water. This is not metaphor - the Greeks knew it too. Narcissus does not fall in love with himself out of mere vanity in the ancient versions of the myth; he falls because the pool returns a perfect image, and perfection in a mirror was understood as a form of entrapment. Water-gazing, or hydromancy, appears in Greek, Roman, and Mesopotamian sources and carries one consistent feature across all of them: the surface must be absolutely still. A ripple breaks the vision. This is the technical core of all scrying - stilling the surface to still the mind.
By the medieval period, the range of scrying surfaces had expanded considerably. The thirteenth-century Franciscan friar and natural philosopher Roger Bacon was said to possess a mirror made of "perspective glass" capable of showing events at a distance. The legend is probably larger than the object, but it reflects a real preoccupation: the idea that a sufficiently clear, sufficiently prepared surface could bypass distance and time. Bacon wrote seriously about the optical properties of mirrors - concave, convex, and flat - and the same optical understanding underpinned the magical claims. A concave mirror concentrates what it reflects; to practitioners of the period, concentration of light was close enough to concentration of spiritual force.
John Dee''s obsidian mirror - which survives today in the British Museum collection - is the most famous scryers'' tool in the English tradition. Dee, Queen Elizabeth''s court astrologer and mathematician, acquired the disk in the 1580s. It is a polished circle of Aztec obsidian, approximately seventeen centimetres in diameter, brought to Europe during the Spanish conquests of Mexico. Dee did not use it alone: his collaborator Edward Kelley served as the "skryer," the one who gazed while Dee recorded the visions and voices. Their sessions produced the Enochian language, a constructed angelic script that occultists have worked with ever since. Whatever one makes of the sessions themselves, the methodology was precise - specific planetary hours, specific invocations, consistent positioning of the mirror at a fixed angle to avoid reflections from the window.
Making a magic mirror was a ritual process, not a craft project. The Izida journal described the traditional requirements: the material must be chosen for its receptivity - black glass was preferred because it absorbed rather than scattered light, creating a genuine depth of field for the gaze; obsidian for the same reason. The preparation involved planetary timing. A mirror intended for Venus-work - love, beauty, hidden attraction - was to be cast, polished, and consecrated on a Friday during the hour of Venus, with the corresponding seal inscribed on the back. Mirrors for Saturn - revealing hidden enemies, the dead, the long-past - required Saturday consecration, with appropriate ritual tools. The consecration was the mirror''s activation: untreated black glass is merely dark; consecrated glass, according to the tradition, is dark in a specific, directed way.
The psychology of what happens in a scrying session is better understood now than it was in Dee''s time. The visual system, starved of external input in a dim, low-contrast environment, begins generating its own imagery - a phenomenon called phosphene production and, at the threshold of sleep, hypnagogia. The deep, steady gaze into a dark surface suppresses blink reflex, reduces saccadic eye movement, and the brain interprets the resulting visual noise as forms. This is not hallucination in the clinical sense; it is the mind''s pattern-recognition running in low-signal conditions. The scryer''s training, across all traditions, consists partly of learning which patterns to follow and which to discard. Water does not lie - but it speaks in a language that takes years to read.