Eyes playing tricks on you?

21 February 2014

Channels or ridges?  (Photo: Chris Cawood)

Channels or ridges? (Photo: Chris Cawood)

Now and again along comes a photograph of a completely natural scenario that, in two dimensions, appears juxtaposed.  In this photograph, are these sandy ridges or hollows?  There’s something in the picture which, if you focus on it, allows you to see the true 3-D picture.

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