It was the culmination of nearly a decade's worth of Eliasson's "immersive environments," as he calls them, many re-creating the effects of natural phenomena, like rainbows or solar eclipses, within museums and galleries. His was an art, coming from afar, that spoke to nature-starved urban sophisticates whose only contact with waterfalls or moss might take this highly mediated form. But it also reached out across class and geographical divides, using perceptual conundrums to dislodge received certainties about our relationship to art, our bodies, and our environment.