Amid the mist-cloaked, forested slopes of the Dyfi Valley, outside the Welsh market town of Machynlleth, is a remarkable sight: a seemingly ramshackle collection of log cabins, old wind turbines, thatched huts, steel tubes and funicular railways, rising from the banks of a former slate quarry. It looks at once incongruous and perfectly at home; both organic and man-made, as if it had grown there like a strange bionic jungle from the seeds of industry long abandoned. Perhaps that's appropriate, given that the Centre for Alternative Technology (CAT) has spent the last half a century redefining the relationship between nature and humankind.

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