On a fairy hunt (Bridgeman/Getty)

It’s a long time since I took mushrooms, but my recollection is that the experience is profoundly reality-warping. Assumptions dissolve; mundane details or textures are suddenly fascinating; the wider world no longer echoes back your habitual understanding of it, but invites wild new interpretations.
Such an experience is starkly at odds with the world we inhabit today — one that has, over recent centuries, been progressively disenchanted by its subordination to the instrumental logic of science and technology. Medieval Christianity viewed the world as a book of signs, written by God and open to poetic or mystical interpretation. It was only around the 17th century — the age of Bacon and Descartes — that we began in earnest to lose the capacity for this kind of thinking. Then God first withdrew to the status of “watchmaker” for the world as mechanical watch, and finally — for many — disappeared altogether in favour of science and logic.
The shift away from the medieval mindset toward the scientific one is usually seen as a positive one. But it has left us poorly-equipped (unless we’re on mushrooms) to grasp just how different the thought-worlds of our forebears were, and how thronged with the uncanny. As folklorist Francis Young recounts, until relatively recently the British Isles was alive with “godlings”: spirits, creatures of legend and folklore. Young recounts the record of 6th-century Welsh St Samson of Dol, who reportedly encountered a terrifying “theomacha”, a “God fighter”, while travelling through a Welsh forest – an entity in the figure of an old woman who attacked and injured St Samson’s companion. Nor were such eldritch encounters only a feature of the so-called “Dark Ages” that preceded the medieval era. The 12th-century Gerald of Wales recounts meeting a man who would converse with “tiny huntsmen” who would tell him people’s secret sins.
Sometimes on woodland dog-walks after dark, the gleam of my torch will catch the eyes of a hidden muntjac and I’ll realise with a jolt that the woodland has been watching me all the time. When I try to picture life with all those non-human watchers, but without the comforting beam of light, it’s easy to imagine knowing that fairies are real.
At the very least, perhaps such beings represent a poetic way of expressing something indisputable: that there exist life-forms unfathomably different from our own, but deeply bound up with ours. The scientific explanation for the “fairy ring” circular pattern of mushroom growth is the underground presence of tiny threads called mycelia, that grow through the soil in a circular formation. As the biologist Merlin Sheldrake argues, such mycelia together form a primordial “mycorrhizal network” — a vast, underground matrix. And while this is not an “intelligence” in any sense we’d recognise, it is essential to plant life: an “ancient association” which “gave rise to all recognisable life on land”.
More than two centuries on from William Paley’s “watchmaker theory”, the received mainstream understanding of the world has little to say about mysterious underground mycorrhizal networks. Rather, it tends to describe a mechanistic universe, made of atoms, and devoid of governing intelligence or telos. For someone raised with this worldview, being stripped by hallucinogens of this frame of logic and causality can be exhilarating, eye-opening or simply terrifying. But even accepting that mind-altering substances can, well, alter the mind, even those who indulge would generally view the change as a mere chemical effect.
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