Imagine: an early summer day in the country, and you’re enjoying a view over a golden landscape dotted with the vibrant colours of wild flowers.  The sun is warming your back and a light breeze eddies through the long grass.  You’re rambling along the edge of a field, listening to the birdsong from the hedgerow, contentedly daydreaming about the lazy afternoon ahead.

But now – you have to climb a wooded hillside.  You pass under the trees, and the canopy blocks the sunlight.  No birds sing here, and the air is still.  You venture forward, but you can’t make out a path.  You turn to the right and then the left.  It’s not clear which way you need to go.  You feel a little anxious, and suddenly sense that someone is watching you. Continue reading →