Pattern recognition

Over countless generations, we have evolved to recognise various danger signals. Most of these triggers are now laughably redundant in our modern, civilised lives. The stick which isn't a snake. The brightly coloured piece of litter masquerading as a poisonous insect...

But, sometimes,we still have the uneasy feeling between the shoulder-blades that tells us that we are being watched. Or we glimpse something that reminds us of a face. A face that makes us uncomfortable. A face that makes us want to be somewhere else...