The Guardian Eyewitness is one of my favourite I-Pad Apps – a spectacular  image delivered daily taking you to the heart of world events or simply displaying a virtuoso piece of photography.

A good example from a couple of days ago is this shot by Robert Boesch which, at first glance, looks like  a giant cactus but actually shows twenty-eight climbers simultaneously scaling the 1,000 metre high Ago Del Torrone in Northern Italy. Rather them than me!

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