About 80ft high, I'd guess, it is beautiful rather than vast - a rushing stream that catches the light from an opening in the forest canopy and plunges into a pool where there were two people bathing, and from which, surprisingly, they produced a large basket of freshwater crabs.

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The idea that you could silence or activate neurons with light is a powerful one in combination with the tools that Boyden and Forest are working on together.

CNN: Top brain scientist is 'philosopher at heart'

The album art is moody and dark, per requirements, though a touch less ominous-looking than what you find on many other covers: what might be a couch under a sheet sits in the middle of a forest rendered in shades of light green and brown.

NEWYORKER: The Dark Arts

The spell was broken, and as if on cue, a Forest Service Jeep came rolling down the road in the dying light.

BBC: The trip that changed national parks forever