Low cloud sweeps across the mountains followed by squally rain.

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Joel, a chef, was last seen at 11, 000ft (3, 350m) heading into a cloud as the weather changed over the mountains.

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Up in the mountains, walking between villages enveloped by cloud, I come across a woman watching her flock of wether lambs.

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The hottest tech trend of the year is Big Data, the application of powerful new analytical tools to the mountains of data now being created by the Cloud and by millions of new sensors embedded into the natural world.

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'A sheet of snow gleamed on the slopes of these distant mountains... the peaks brazenly pierced the grey cloud to reappear above the shifting vapours like reefs, suspended in the sky...

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But walking in Bolivia is also an experience in diversity: one day you can be in snow-covered mountains and the next you might descend through moss-strewn cloud forests to jungle lowlands.

BBC: In Bolivia, awe-inspiring scenes at every turn

Trapped on three sides by high mountains, this warm, moist air forms huge clouds that then discharge electricity in powerful cloud-to-cloud storms.

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Their solution was to yield most of the canvas or panel to the gray, fog-and cloud-filled sky (curator Emilie Gordenker, director of the Mauritshuis, calls them "our Dutch mountains"), with blue openings torn into the gray here and there so that spots of sunlight could illuminate parts of the land or water below.

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