“…When I was about 12 years old, Weetabix gave away a series of 3-D picture cards featuring animals – you would find them nestling between the box and the inner bag. The idea was that you could send off for a special ‘Vista-Screen’ viewer which, when the pictures were inserted, made them leap into amazing 3-D. The effect was pure magic – a window into another world. It was the beginning of a love affair that has lasted most of my life, and has drawn me into an extraordinary trail of historical discovery. Stereoscopy – to give 3-D imaging its proper name – is simple in principle. In real life our eyes see two slightly different versions of the same view – and our brains work to combine these into an instant read-out. Stereoscopy is a form of photography that works in the same way…” Read here.